Why XAFS is Difficult on BaTiO3

Transmission EXAFS spectrum of BaTiO3 across the Ti K and Ba LIII edges

[[Image showing transmission EXAFS spectrum of BaTiO3 across the Ti K and Ba L3 edges]]

The proximity of the Ba LIII edge to the Ti K edge severely limits the range over which the Ti K edge EXAFS can be analyzed. This energy difference corresponds to about 8.3Å-1 of photoelectron wave-number.

EXAFS is essentially a signal processing problem with a bandwidth set, in part, by the extent of the available data in photoelectron wave-number.

The information content in a band this narrow is insufficient for the kind of quantitative analysis necessary to resolve the structures of titanium perovskites.[4]

 

How can I proceed?

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Bruce Ravel

Last modified: Wed Feb 18 15:56:11 EST 1998