Difference between revisions of "Absorption edge"
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| − | (French: ''Discontinuité, arête d'absorption''. German: ''Absorptionskante''. Spanish: ''Canto de absorción''. Russian: ''край поглощения''). | + | (<Font color="blue">French: ''Discontinuité, arête d'absorption''</Font>. <Font color="red">German: ''Absorptionskante''</Font>. <Font color="green">Spanish: ''Canto de absorción''</Font>. <Font color="purple">Russian: ''край поглощения''</Font>). |
Revision as of 06:06, 3 February 2006
(French: Discontinuité, arête d'absorption. German: Absorptionskante. Spanish: Canto de absorción. Russian: край поглощения).
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