https://dictionary.iucr.org/index.php?action=history&feed=atom&title=Flack_parameter
Flack parameter - Revision history
2026-06-04T08:01:58Z
Revision history for this page on the wiki
MediaWiki 1.30.0
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=4787&oldid=prev
ShigeruOhba at 13:16, 26 March 2019
2019-03-26T13:16:57Z
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 13:16, 26 March 2019</td>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><font color="blue">Paramètre de Flack</font> (''Fr''). <font color="red">Flack-Parameter</font> (''Ge''). <font color="black">Parametro di Flack</font> (''It''). <font color="purple"><del class="diffchange diffchange-inline">フラック媒介変数</del></font> (''Ja''). <font color="green">Parámetro de Flack</font> (''Sp'').</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><font color="blue">Paramètre de Flack</font> (''Fr''). <font color="red">Flack-Parameter</font> (''Ge''). <font color="black">Parametro di Flack</font> (''It''). <font color="purple"><ins class="diffchange diffchange-inline">フラック変数</ins></font> (''Ja''). <font color="green">Parámetro de Flack</font> (''Sp'').</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
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ShigeruOhba
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=4462&oldid=prev
BrianMcMahon: Tidied translations and added German and Spanish (U. Mueller)
2017-11-13T13:35:31Z
<p>Tidied translations and added German and Spanish (U. Mueller)</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 13:35, 13 November 2017</td>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><font color="blue">Paramètre de Flack</<del class="diffchange diffchange-inline">Font</del>> (''Fr''). <font color="black">Parametro di Flack</<del class="diffchange diffchange-inline">Font</del>> (''It''). <font color="purple">フラック媒介変数</<del class="diffchange diffchange-inline">Font</del>> (''Ja'').</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><font color="blue">Paramètre de Flack</<ins class="diffchange diffchange-inline">font</ins>> (''Fr<ins class="diffchange diffchange-inline">''). <font color="red">Flack-Parameter</font> (''Ge</ins>''). <font color="black">Parametro di Flack</<ins class="diffchange diffchange-inline">font</ins>> (''It''). <font color="purple">フラック媒介変数</<ins class="diffchange diffchange-inline">font</ins>> (''Ja<ins class="diffchange diffchange-inline">''). <font color="green">Parámetro de Flack</font> (''Sp</ins>'').</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
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BrianMcMahon
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=3998&oldid=prev
BrianMcMahon: Edits to align with printed edition
2017-05-15T11:07:16Z
<p>Edits to align with printed edition</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 11:07, 15 May 2017</td>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><font color="blue">Paramètre de Flack</Font> (''Fr'')<del class="diffchange diffchange-inline">; </del><font color="black">Parametro di Flack</Font> (''It'')<del class="diffchange diffchange-inline">; </del><font color="purple">フラック媒介変数</Font> (''Ja'').</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><font color="blue">Paramètre de Flack</Font> (''Fr'')<ins class="diffchange diffchange-inline">. </ins><font color="black">Parametro di Flack</Font> (''It'')<ins class="diffchange diffchange-inline">. </ins><font color="purple">フラック媒介変数</Font> (''Ja'').</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>For a multidomain-structure twin of a chiral crystal structure, an equivalent Flack parameter may be calculated according to the method of Flack and Bernardinelli (1999).</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>For a multidomain-structure twin of a chiral crystal structure, an equivalent Flack parameter may be calculated according to the method of Flack and Bernardinelli (1999).</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== See also ==</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*[[Absolute structure]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Related chemical terms ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Related chemical terms ==</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The [http://www.chem.qmul.ac.uk/iupac/stereo/ IUPAC ''Basic Terminology of Stereochemistry''] contains definitions of related chemical terms of use to the crystallographer, ''viz'': [http://www.chem.qmul.ac.uk/iupac/stereo/A.html#01 ''absolute configuration''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#16 ''chiral''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#17 ''chirality''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#22 ''chirality sense''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#24 ''enantiomer''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#28 ''enantiomerically pure''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#32  ''enantiomorph''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#06 ''racemate''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#07 ''racemic''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#09 ''racemic conglomerate''] and [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#14 ''relative configuration''].</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The [http://www.chem.qmul.ac.uk/iupac/stereo/ IUPAC ''Basic Terminology of Stereochemistry''] contains definitions of related chemical terms of use to the crystallographer, ''viz'': [http://www.chem.qmul.ac.uk/iupac/stereo/A.html#01 ''absolute configuration''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#16 ''chiral''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#17 ''chirality''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#22 ''chirality sense''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#24 ''enantiomer''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#28 ''enantiomerically pure''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#32  ''enantiomorph''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#06 ''racemate''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#07 ''racemic''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#09 ''racemic conglomerate''] and [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#14 ''relative configuration''].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== References ==</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*Flack, H. D. and Bernardinelli, G. (1999). ''Acta Cryst.'' A'''55''', 908–915. ''Absolute structure and absolute configuration''</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*IUPAC (1996). ''Basic Terminology of Stereochemistry.'' http://www.chem.qmul.ac.uk/iupac/stereo</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Fundamental crystallography]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Fundamental crystallography]]</div></td></tr>
</table>
BrianMcMahon
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=3643&oldid=prev
MassimoNespolo: languages
2016-03-30T11:30:59Z
<p>languages</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 11:30, 30 March 2016</td>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><font color="blue">Paramètre de Flack</Font> (''Fr''); <font color="black">Parametro di Flack</Font> (''It''); <font color="purple">フラック媒介変数</Font> (''Ja'').</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
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MassimoNespolo
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=3354&oldid=prev
HowardFlack at 13:42, 11 October 2013
2013-10-11T13:42:43Z
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<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 13:42, 11 October 2013</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3" >Line 3:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <math>x</math> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <math>C</math> represents an oriented two-domain-structure crystal, [[twinning by inversion|twinned by inversion]], consisting of an oriented domain structure <math>X</math> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <math>x</math> is defined by the structure-amplitude equation</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <math>x</math> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <math>C</math> represents an oriented two-domain-structure crystal, [[twinning by inversion|twinned by inversion]], consisting of an oriented domain structure <math>X</math> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <math>x</math> is defined by the structure-amplitude equation</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(<del class="diffchange diffchange-inline">-</del>h, <del class="diffchange diffchange-inline">-</del>k, <del class="diffchange diffchange-inline">-</del>l)|^2</math>.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(<ins class="diffchange diffchange-inline">{\bar </ins>h<ins class="diffchange diffchange-inline">}</ins>, <ins class="diffchange diffchange-inline">{\bar </ins>k<ins class="diffchange diffchange-inline">}</ins>, <ins class="diffchange diffchange-inline">{\bar </ins>l<ins class="diffchange diffchange-inline">}</ins>)|^2</math>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>For a multidomain-structure twin of a chiral crystal structure, an equivalent Flack parameter may be calculated according to the method of Flack and Bernardinelli (1999).</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>For a multidomain-structure twin of a chiral crystal structure, an equivalent Flack parameter may be calculated according to the method of Flack and Bernardinelli (1999).</div></td></tr>
</table>
HowardFlack
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=3303&oldid=prev
GervaisChapuis at 16:58, 26 August 2013
2013-08-26T16:58:39Z
<p></p>
<table class="diff diff-contentalign-left" data-mw="interface">
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<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 16:58, 26 August 2013</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <math>x</math> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <math>C</math> represents an oriented two-domain-structure crystal, <del class="diffchange diffchange-inline">twinned by inversion (see entry </del>[[twinning by inversion]]<del class="diffchange diffchange-inline">)</del>, consisting of an oriented domain structure <math>X</math> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <math>x</math> is defined by the structure-amplitude equation</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <math>x</math> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <math>C</math> represents an oriented two-domain-structure crystal, [[twinning <ins class="diffchange diffchange-inline">by inversion|twinned </ins>by inversion]], consisting of an oriented domain structure <math>X</math> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <math>x</math> is defined by the structure-amplitude equation</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td></tr>
</table>
GervaisChapuis
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=3302&oldid=prev
GervaisChapuis at 16:45, 26 August 2013
2013-08-26T16:45:29Z
<p></p>
<table class="diff diff-contentalign-left" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr style="vertical-align: top;" lang="en">
<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 16:45, 26 August 2013</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <math>x</math> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <math>C</math> represents an oriented two-domain-structure crystal, twinned by inversion, consisting of an oriented domain structure <math>X</math> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <math>x</math> is defined by the structure-amplitude equation</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <math>x</math> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <math>C</math> represents an oriented two-domain-structure crystal, twinned by inversion <ins class="diffchange diffchange-inline">(see entry [[twinning by inversion]])</ins>, consisting of an oriented domain structure <math>X</math> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <math>x</math> is defined by the structure-amplitude equation</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td></tr>
</table>
GervaisChapuis
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=3196&oldid=prev
BrianMcMahon at 13:16, 6 February 2012
2012-02-06T13:16:00Z
<p></p>
<table class="diff diff-contentalign-left" data-mw="interface">
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<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 13:16, 6 February 2012</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l11" >Line 11:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The [http://www.chem.qmul.ac.uk/iupac/stereo/ IUPAC ''Basic Terminology of Stereochemistry''] contains definitions of related chemical terms of use to the crystallographer, ''viz'': [http://www.chem.qmul.ac.uk/iupac/stereo/A.html#01 ''absolute configuration''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#16 ''chiral''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#17 ''chirality''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#22 ''chirality sense''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#24 ''enantiomer''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#28 ''enantiomerically pure''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#32  ''enantiomorph''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#06 ''racemate''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#07 ''racemic''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#09 ''racemic conglomerate''] and [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#14 ''relative configuration''].</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The [http://www.chem.qmul.ac.uk/iupac/stereo/ IUPAC ''Basic Terminology of Stereochemistry''] contains definitions of related chemical terms of use to the crystallographer, ''viz'': [http://www.chem.qmul.ac.uk/iupac/stereo/A.html#01 ''absolute configuration''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#16 ''chiral''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#17 ''chirality''], [http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#22 ''chirality sense''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#24 ''enantiomer''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#28 ''enantiomerically pure''], [http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#32  ''enantiomorph''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#06 ''racemate''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#07 ''racemic''], [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#09 ''racemic conglomerate''] and [http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#14 ''relative configuration''].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">----</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Fundamental crystallography]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Fundamental crystallography]]</div></td></tr>
</table>
BrianMcMahon
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=1545&oldid=prev
HowardFlack at 12:57, 14 February 2006
2006-02-14T12:57:13Z
<p></p>
<table class="diff diff-contentalign-left" data-mw="interface">
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<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 12:57, 14 February 2006</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <<del class="diffchange diffchange-inline">I</del>>x</<del class="diffchange diffchange-inline">I</del>> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <<del class="diffchange diffchange-inline">I</del>>C</<del class="diffchange diffchange-inline">I</del>> represents an oriented two-domain-structure crystal, twinned by inversion, consisting of an oriented domain structure <<del class="diffchange diffchange-inline">I</del>>X</<del class="diffchange diffchange-inline">I</del>> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <<del class="diffchange diffchange-inline">I</del>>x</<del class="diffchange diffchange-inline">I</del>> is defined by the structure-amplitude equation</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <<ins class="diffchange diffchange-inline">math</ins>>x</<ins class="diffchange diffchange-inline">math</ins>> in the defining equation <math>C=(1-x)X + x\bar X</math>, where <<ins class="diffchange diffchange-inline">math</ins>>C</<ins class="diffchange diffchange-inline">math</ins>> represents an oriented two-domain-structure crystal, twinned by inversion, consisting of an oriented domain structure <<ins class="diffchange diffchange-inline">math</ins>>X</<ins class="diffchange diffchange-inline">math</ins>> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <<ins class="diffchange diffchange-inline">math</ins>>x</<ins class="diffchange diffchange-inline">math</ins>> is defined by the structure-amplitude equation</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l9" >Line 9:</td>
<td colspan="2" class="diff-lineno">Line 9:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Related chemical terms ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Related chemical terms ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The [http://www.chem.qmul.ac.uk/iupac/stereo/ IUPAC ''Basic Terminology of Stereochemistry''] contains definitions of related chemical terms of use to the crystallographer, ''viz'': ''absolute configuration'', ''chiral'', ''chirality'', ''chirality sense'', ''enantiomer'', ''enantiomerically pure'',  ''enantiomorph'', ''racemate'', ''racemic'', ''racemic conglomerate'' and ''relative configuration''.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The [http://www.chem.qmul.ac.uk/iupac/stereo/ IUPAC ''Basic Terminology of Stereochemistry''] contains definitions of related chemical terms of use to the crystallographer, ''viz'': <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/A.html#01 </ins>''absolute configuration''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#16 </ins>''chiral''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#17 </ins>''chirality''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/BC.html#22 </ins>''chirality sense''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#24 </ins>''enantiomer''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#28 </ins>''enantiomerically pure''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/DE.html#32 </ins> ''enantiomorph''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#06 </ins>''racemate''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#07 </ins>''racemic''<ins class="diffchange diffchange-inline">]</ins>, <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#09 </ins>''racemic conglomerate''<ins class="diffchange diffchange-inline">] </ins>and <ins class="diffchange diffchange-inline">[http://www.chem.qmul.ac.uk/iupac/stereo/RS.html#14 </ins>''relative configuration''<ins class="diffchange diffchange-inline">]</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
</table>
HowardFlack
https://dictionary.iucr.org/index.php?title=Flack_parameter&diff=1544&oldid=prev
HowardFlack: /* Definition */
2006-02-14T12:44:26Z
<p><span dir="auto"><span class="autocomment">Definition</span></span></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 12:44, 14 February 2006</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Definition ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <I>x</I> in the defining equation <math>C=(1-x)X +x<del class="diffchange diffchange-inline">-</del>X</math>, where <I>C</I> represents an oriented two-domain-structure crystal, twinned by inversion, consisting of an oriented domain structure <I>X</I> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <I>x</I> is defined by the structure-amplitude equation</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The Flack parameter is the molar fraction <I>x</I> in the defining equation <math>C=(1-x)X + x<ins class="diffchange diffchange-inline">\bar </ins>X</math>, where <I>C</I> represents an oriented two-domain-structure crystal, twinned by inversion, consisting of an oriented domain structure <I>X</I> and an oriented inverted domain structure <math>\bar X</math>. In reciprocal space, the Flack parameter <I>x</I> is defined by the structure-amplitude equation</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><math>G^2(h,k,l,x)=(1-x)|F(h,k,l)|^2 + x|F(-h, -k, -l)|^2</math>.</div></td></tr>
</table>
HowardFlack