# Difference between revisions of "Absorption edge"

### From Online Dictionary of Crystallography

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Section 4.2.3 of ''International Tables of Crystallography, Volume C'' | Section 4.2.3 of ''International Tables of Crystallography, Volume C'' | ||

− | [[Category:X-rays]] | + | [[Category:X-rays]] |

+ | [[Category: X-ray absorption spectroscopy]] |

## Revision as of 15:38, 12 April 2016

Discontinuité, 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 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*, *L _{I}*,

*L*,

_{II}*L*, etc.).

_{III}## 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*