Absorption edge

From Online Dictionary of Crystallography

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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'').  <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="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'').
== Definition ==
== Definition ==
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== Examples ==
== Examples ==
For gallium:  
For gallium:  
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<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;
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<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:  
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<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;
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<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 ==
== See also ==
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*[[Absorption threshold]]
*[[Absorption threshold]]
*[[Fermi level]]
*[[Fermi level]]
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*Section 4.2.3 of ''International Tables of Crystallography, Volume C''
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*Section 4.2.3 of ''International Tables for Crystallography, Volume C''
[[Category:X-rays]]
[[Category:X-rays]]
[[Category: X-ray absorption spectroscopy]]
[[Category: X-ray absorption spectroscopy]]

Revision as of 10:52, 12 May 2017

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

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