# Difference between revisions of "Absorption edge"

### From Online Dictionary of Crystallography

(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:

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

For arsenic:

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