Actions

Absorption edge

From Online Dictionary of Crystallography

Revision as of 17:31, 9 December 2005 by BrianMcMahon (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Other languages

Discontinuité ou arête d'absorption (Fr). Absorptionskante (Ge). Canto de absorción (Sp). край поглощения (Ru)


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; λLI = 9.5446 Ǻ; λLII = 10.8414 Ǻ; λLIII = 11.1038 Ǻ;

For arsenic:

λK = 1.0448 Ǻ; λLI = 8.1195 Ǻ; λLII = 9.1187 Ǻ; λLIII = 9.3617 Ǻ;


See also

Section 4.2.3 of International Tables of Crystallography, Volume C