Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

X-ray absorption spectroscopy including EXAFS and XANES

The absorption of x rays by materials has been studied for many years, but x-ray absorption spectroscopy has only become an important tool in structure and bonding studies over the past decade. This has been partly because of advances in theory, but chiefly because of the availability of synchrotron radiation sources providing x rays three or more orders of magnitude more intense than those from the standard x-ray tube. Spectral measurements formerly taking a week or more can now be completed in minutes. [Pg.29]

Synchrotron radiation is emitted when relativistic charged particles travel in curved paths in magnetic fields (and hence is a byproduct of high-energy physics experiments). Although x-ray absorption spectra can be [Pg.29]

The absorption of an x-ray photon of energy E by a sample of thickness X is given by  [Pg.30]

For x-ray absorption of a metal atom embedded in a solid, fJL,o,ai( ) beyond the absorption edge is made up of (1) absorption of the matrix [polE)] in which the metal atom is embedded, and (2) absorption due to the metal atom under study [ Xa ( ]- Hence  [Pg.30]

Within the first 20-30 eV of the edge, a further contribution due to multiple scattering, Xxanfs(F), is present. Both p-xanes and Phxaf.s are small contributions to the total absorption by the sample. [Pg.30]


See other pages where X-ray absorption spectroscopy including EXAFS and XANES is mentioned: [Pg.29]   


SEARCH



Absorption EXAFS

EXAFS

EXAFS and X-Ray Absorption Spectroscopy

EXAFS spectroscopy

Spectroscopy x-ray absorption

X rays spectroscopy and

X-ray EXAFS

X-ray absorption spectroscopy (EXAFS and XANES)

X-ray spectroscopy EXAFS

XANES

© 2024 chempedia.info