Absorption edge

From Online Dictionary of Crystallography

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(<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>). <Font color="black">Spigolo di assorbimento </Font>(''It'')
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(<Font color="blue">Discontinuité, arête d'absorption</Font> (''Fr''). <Font color="red"> Absorptionskante </Font> (''Ge''). <Font color="green">Canto de absorción</Font> (''Sp''). <Font color="purple">край поглощения</Font> (''Ru''). <Font color="black">Spigolo di assorbimento </Font>(''It'')

Revision as of 05:53, 18 March 2006

(Discontinuité, arête d'absorption (Fr). Absorptionskante (Ge). Canto de absorción (Sp). край поглощения (Ru). Spigolo di assorbimento (It)


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:

λK = 1.1958 Ǻ; \lambda_{L_{I}} = 9.5446 Ǻ; \lambda_{L_{II}} = 10.8414 Ǻ; \lambda_{L_{III}}= 11.1038 Ǻ;

For arsenic:

λK = 1.0448 Ǻ; \lambda_{L_{I}} = 8.1195 Ǻ; \lambda_{L_{II}} = 9.1187 Ǻ; \lambda_{L_{III}}= 9.3617 Ǻ;


See also

Section 4.2.3 of International Tables of Crystallography, Volume C