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Difference between revisions of "X-ray absorption spectroscopy (XAS)"

From Online Dictionary of Crystallography

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Revision as of 15:10, 12 April 2016

Definition

X-ray Absorption Spectroscopy (XAS) is a technique for measuring the linear absorption coefficient µ(E) of a substance as a function of the incident photon energy E in the X-ray regime. This technique is element and orbital-specific and determines the local atomic and electronic structure of matter. XAS conventionally includes techniques of XAFS (q.v.), which in turn includes both XANES and EXAFS (q.v.). An XAS spectrum may also be obtained using fluorescence, electron yield and scattering processes indirectly (i.e. without directly measuring the absorption of X-rays).

See also

  • EXAFS - Extended X-ray absorption fine structure
  • X-ray absorption fine structure (XAFS)