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Multiple-electron excitation in X-ray absorption: a simple generic model

By Mervyn Roy, J. D. Lindsay, S. Louch and Steve J. Gurman


The probability of multiple-electron excitation in X-ray absorption is calculated using a simple generic model. The model permits calculations to be made for all atoms with little input data or computing effort. The high-energy limit of this probability, which gives the usual EXAFS amplitude reduction factor, is calculated in the `sudden approximation' using Slater orbitals. Good agreement with experiment is found. The energy dependence of this probability is also calculated using a simple model form of perturbing potential and found to agree well with experiment for rare gas atoms. The effect on the X-ray absorption coefficient of including multiple-electron excitations is also determined and is found to be small, again in agreement with observation

Publisher: International Union of Crystallography
Year: 2001
DOI identifier: 10.1107/S0909049501008160
OAI identifier:

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