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Difference between revisions of "Absorption edge"

From Online Dictionary of Crystallography

 
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For gallium:  
 
For gallium:  
  
&#955;''<sub>K</sub>'' = 1.1958 Ǻ; &#955;''<sub>LI</sub>'' = 9.5446 Ǻ; &#955;''<sub>LII</sub>'' = 10.8414 Ǻ; &#955;''<sub>LIII</sub>'' = 11.1038 Ǻ;
+
<math>\lambda_{K}</math> = 1.1958 Ǻ; <math>\lambda_{L_{I}}</math> = 9.5446 Ǻ; <math>\lambda_{L_{II}}</math> = 10.8414 Ǻ; <math>\lambda_{L_{III}}</math>= 11.1038 Ǻ;
  
 
For arsenic:  
 
For arsenic:  
  
&#955;''<sub>K</sub>'' = 1.0448 Ǻ; &#955;''<sub>LI</sub>'' = 8.1195 Ǻ; &#955;''<sub>LII</sub>''  = 9.1187 Ǻ; &#955;''<sub>LIII</sub>''  = 9.3617 Ǻ;
+
<math>\lambda_{K}</math> = 1.0448 Ǻ; <math>\lambda_{L_{I}}</math> = 8.1195 Ǻ; <math>\lambda_{L_{II}}</math> = 9.1187 Ǻ; <math>\lambda_{L_{III}}</math>= 9.3617 Ǻ;
  
  

Revision as of 16:29, 26 January 2006

Other languages

Discontinuité ou arête d'absorption (Fr). Absorptionskante (Ge). Canto de absorción (Sp). край поглощения (Ru)


Definition

An absorption edge is a sharp discontinuity in the absorption spectrum of X-rays by an element that occurs when the energy of the photon corresponds to the energy of a shell of the atom (K, LI, LII, LIII, etc.).


Examples

For gallium:

[math]\lambda_{K}[/math] = 1.1958 Ǻ; [math]\lambda_{L_{I}}[/math] = 9.5446 Ǻ; [math]\lambda_{L_{II}}[/math] = 10.8414 Ǻ; [math]\lambda_{L_{III}}[/math]= 11.1038 Ǻ;

For arsenic:

[math]\lambda_{K}[/math] = 1.0448 Ǻ; [math]\lambda_{L_{I}}[/math] = 8.1195 Ǻ; [math]\lambda_{L_{II}}[/math] = 9.1187 Ǻ; [math]\lambda_{L_{III}}[/math]= 9.3617 Ǻ;


See also

Section 4.2.3 of International Tables of Crystallography, Volume C