Absorption edge

From Online Dictionary of Crystallography

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<Font color="blue">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''). <Font color="prple">吸収端 </Font>(''Ja'').
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<font color="blue">Arête d'absorption</font> (''Fr''). <font color="red">Absorptionskante</font> (''Ge''). <font color="black">Spigolo di assorbimento</font>(''It''). <font color="purple">吸収端</font> (''Ja''). <font color="purple">край поглощения</font> (''Ru''). <font color="green">Canto de absorción</font> (''Sp'').
== Definition ==
== Definition ==

Revision as of 17:37, 8 November 2017

Arête d'absorption (Fr). Absorptionskante (Ge). Spigolo di assorbimento(It). 吸収端 (Ja). край поглощения (Ru). Canto de absorción (Sp).

Definition

An absorption edge is the energy at which there is a sharp rise (discontinuity) in the (linear) absorption coefficient of X-rays by an element, which occurs when the energy of the photon corresponds to the energy of a shell of the atom (K, LI, LII, LIII, etc. corresponding to the creation of electron holes in the 122s22, 2s, 2p1/2, 2p3/2 etc. atomic subshells).

Associated with this transition is the absorption threshold (q.v.) characterized by the corresponding energy E0.

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