Anomalous absorption - Revision history

BrianMcMahon: Tidied translations.

2017-11-08T17:54:45Z

Tidied translations.

BrianMcMahon at 11:30, 12 May 2017

2017-05-12T11:30:43Z

BrianMcMahon: Style edits to align with printed edition

2017-05-12T11:25:53Z

Style edits to align with printed edition

BrianMcMahon at 11:24, 12 May 2017

2017-05-12T11:24:51Z

BrianMcMahon at 11:21, 12 May 2017

2017-05-12T11:21:15Z

BrianMcMahon: Edits to align with printed edition

2017-05-12T11:20:28Z

Edits to align with printed edition

BrianMcMahon at 15:53, 3 February 2012

2012-02-03T15:53:38Z

BrianMcMahon at 15:48, 3 February 2012

2012-02-03T15:48:08Z

BrianMcMahon at 08:10, 25 May 2007

2007-05-25T08:10:24Z

AndreAuthier at 05:53, 18 March 2006

2006-03-18T05:53:58Z

← Older revision		Revision as of 17:54, 8 November 2017
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−	<~~Font~~ color="blue">Absorption anomale </~~Font~~>(''Fr''). <~~Font~~ color="red">Anomale Absorption </~~Font~~>(''Ge''). <~~Font~~ color="~~green~~">~~Absorción anómala~~ </~~Font~~>(''Sp''). <~~Font~~ color="~~black~~">~~Assorbimento anomalo~~ </~~Font~~>(''It'').	+	<font color="blue">Absorption anomale</font> (''Fr''). <font color="red">Anomale Absorption</font> (''Ge''). <font color="black">Assorbimento anomalo</font> (''It''). <font color="green">Absorción anómala</font> (''Sp'').

	== Definition ==		== Definition ==

@@ Line 20: / Line 20: @@
 == See also ==
 *[[Borrmann effect]]
-*Section 5.1 of ''International Tables for Crystallography, Volume B'' for X-rays
+*Chapter 5.1 of ''International Tables for Crystallography, Volume B'' for X-rays
-*Section 5.2 of ''International Tables for Crystallography, Volume B'' for electrons
+*Chapter 5.2 of ''International Tables for Crystallography, Volume B'' for electrons
-*Section 5.3 of ''International Tables for Crystallography, Volume B'' for neutrons
+*Chapter 5.3 of ''International Tables for Crystallography, Volume B'' for neutrons
 [[Category:X-rays]]

@@ Line 19: / Line 19: @@
 == See also ==
-*[[Borrman effect]]
+*[[Borrmann effect]]
 *Section 5.1 of ''International Tables for Crystallography, Volume B'' for X-rays
 *Section 5.2 of ''International Tables for Crystallography, Volume B'' for electrons

@@ Line 19: / Line 19: @@
 == See also ==
+*[[Borrman effect]]
-Section 5.1 of ''International Tables for Crystallography, Volume B'' for X-rays
+*Section 5.1 of ''International Tables for Crystallography, Volume B'' for X-rays
+*Section 5.2 of ''International Tables for Crystallography, Volume B'' for electrons
-Section 5.2 of ''International Tables for Crystallography, Volume B'' for electrons
+*Section 5.3 of ''International Tables for Crystallography, Volume B'' for neutrons
 [[Category:X-rays]]

@@ Line 20: / Line 20: @@
 == See also ==
-Section 5.1 of ''International Tables of Crystallography, Volume B'' for X-rays
+Section 5.1 of ''International Tables for Crystallography, Volume B'' for X-rays
-Section 5.2 of ''International Tables of Crystallography, Volume B'' for electrons
+Section 5.2 of ''International Tables for Crystallography, Volume B'' for electrons
-Section 5.3 of ''International Tables of Crystallography, Volume B'' for neutrons
+Section 5.3 of ''International Tables for Crystallography, Volume B'' for neutrons
-[[Category:X-rays]]<br>
+[[Category:X-rays]]

@@ Line 1: / Line 1: @@
-<Font color="blue">Absorption anomale </Font>(''Fr''). <Font color="red">Anomale Absorption </Font>(''Ge''). <Font color="green">Absorción anómala </Font>(''Sp''). <Font color="black">Assorbimento anomalo </Font>(''It'')
+<Font color="blue">Absorption anomale </Font>(''Fr''). <Font color="red">Anomale Absorption </Font>(''Ge''). <Font color="green">Absorción anómala </Font>(''Sp''). <Font color="black">Assorbimento anomalo </Font>(''It'').
 == Definition ==
-Anomalous absorption takes place when radiation is [[dynamical diffraction|dynamically diffracted]] by a perfect or nearly perfect crystal. The optical field in the crystal is then made up by several components, called wavefields, two in the two beam case (neglecting polarization in the X-ray case). One of them is absorbed more than normal and the other one less than normal. In the transmission, or Laue geometry, both wavefields propagate inside the crystal; one then speaks of [[anomalous transmission]] for the less absorbed wavefield ([[Borrmann effect]]).  In the reflection, or Bragg geometry, one wavefield only propagates in the crystal, the more absorbed one for angles of incidence  corresponding to one side of the total reflection rocking curve and the less absorbed one for the other side. This results in an asymmetry of the rocking curve that is calculated using [[dynamical theory]].
+Anomalous absorption takes place when radiation is [[dynamical diffraction|dynamically diffracted]] by a perfect or nearly perfect crystal. The optical field in the crystal is then made up of several components, called wavefields, two in the two-beam case (neglecting polarization in the X-ray case). One of them is absorbed more than normal and the other one less than normal. In the transmission, or Laue, geometry, both wavefields propagate inside the crystal; one then speaks of [[anomalous transmission]] for the less absorbed wavefield ([[Borrmann effect]]).  In the reflection, or Bragg, geometry, one wavefield only propagates in the crystal, the more absorbed one for angles of incidence  corresponding to one side of the total reflection rocking curve and the less absorbed one for the other side. This results in an asymmetry of the rocking curve that is calculated using [[dynamical theory]].
 == Physical interpretation ==
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 [[image:Borrmann-1.png|right]]
-Borrmann (1950) interpreted anomalous absorption by means of the standing waves that are formed by the interference of the incident and reflected waves (Laue 1937, 1941). The nodes and antinodes of these standing waves have the periodicity of the lattice planes. In the transmission geometry (see figure), the nodes lie on the lattice planes for type 1 wavefields, which undergo therefore a quite small absorption, while it is the antinodes that lie on the lattice planes for type 2, which undergo a larger absorption.
+Borrmann (1950) interpreted anomalous absorption by means of the standing waves that are formed by the interference of the incident and reflected waves (Laue, 1937, 1941). The nodes and antinodes of these standing waves have the periodicity of the lattice planes. In the transmission geometry (see figure), the nodes lie on the lattice planes for type 1 wavefields, which undergo therefore a quite small absorption, while it is the antinodes that lie on the lattice planes for type 2, which undergo a larger absorption.
-In the reflection geometry, the nodes and antinodes shift by half a lattice distance as the crystal is rocked through the rocking curve. On the smaller angle side of the rocking curve it is type 1 wavefields that are excited, the nodes lie on the lattice planes and the absorption is small. On the higher angle side of the rocking curve, it is type 2 wavefields that are excited, the antinodes lie on the lattice planes and the absorption is large.
+In the reflection geometry, the nodes and antinodes shift by half a lattice distance as the crystal is rocked through the rocking curve. On the smaller angle side of the rocking curve it is type 1 wavefields that are excited, the nodes lie on the lattice planes and the absorption is small. On the higher angle side of the rocking curve, it is type 2 wavefields that are excited, the antinodes lie on the lattice planes and the absorption is large. This effect is used in the standing-wave technique for observing adsorbed atoms at the surface of crystals.
 == History ==
-Anomalous absorption was discovered by Borrmann on quartz (Borrmann G., 1941, ''Über Extinktionsdiagramme der Röntgenstrahlen von Quarz''. ''Physik Z.'', '''42'''}, 157-162
+Anomalous absorption was discovered by Borrmann on quartz [Borrmann G. (1941). ''Physik Z.'', '''42''', 157-162. ''Über Extinktionsdiagramme der Röntgenstrahlen von Quarz'']
-and calcite crystals (Borrmann G., 1950, ''Die Absorption von Röntgenstrahlen in Fall der Interferenz.'' ''Z. Phys.'', '''127''', 297-323) and first interpreted by [http://journals.iucr.org/10.1107/S0365110X49000242 Laue] (Laue, M. von, 1949, ''Die Absorption der  Röntgenstrahlen in Kristallen im Interferenzfall.'' ''Acta Crystallogr.'', '''2''', 106-113).
+and calcite crystals [Borrmann G. (1950). ''Z. Phys.'', '''127''', 297-323. ''Die Absorption von Röntgenstrahlen in Fall der Interferenz''] and first interpreted by [http://journals.iucr.org/10.1107/S0365110X49000242 Laue] [Laue, M. von (1949). ''Acta Cryst.'', '''2''', 106-113. ''Die Absorption der  Röntgenstrahlen in Kristallen im Interferenzfall''].
 == See also ==

← Older revision		Revision as of 15:53, 3 February 2012
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	Section 5.3 of ''International Tables of Crystallography, Volume B'' for neutrons		Section 5.3 of ''International Tables of Crystallography, Volume B'' for neutrons
−
−
−	~~----~~

	[[Category:X-rays]]<br>		[[Category:X-rays]]<br>

← Older revision		Revision as of 05:53, 18 March 2006
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−	<Font color="blue">Absorption anomale </Font>(''Fr''). <Font color="red">Anomale Absorption </Font>(''Ge''). <Font color="green">Absorción anómala </Font>(''Sp'').<Font color="black">Assorbimento anomalo </Font>(''It'')	+	<Font color="blue">Absorption anomale </Font>(''Fr''). <Font color="red">Anomale Absorption </Font>(''Ge''). <Font color="green">Absorción anómala </Font>(''Sp''). <Font color="black">Assorbimento anomalo </Font>(''It'')