Excited state electronic structure and the theory of x-ray spectra

被引:10
作者
Rehr, JJ [1 ]
机构
[1] Univ Washington, Dept Phys, Seattle, WA 98195 USA
关键词
D O I
10.1088/0953-8984/15/5/317
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
There has been dramatic progress in recent years both in efficient calculations and in the interpretation of various x-ray spectroscopies. For example, real-space multiple-scattering theory gives a unified treatment of extended x-ray absorption fine structure, near edge structure, x-ray magnetic circular dichroism and other spectroscopies. Here we discuss the theory of x-ray spectra in the framework of excited state electronic structure. These are closely connected since x-ray spectra are directly related to a Green function for the excited photoelectron in the presence of a core hole. However, corrections to the independent electron approximation are needed to account for many-body effects such as inelastic losses, screening, and core-hole effects. We discuss recent approaches for calculating such corrections and show that they can explain some of the remaining discrepancies between theory and experiment.
引用
收藏
页码:S647 / S654
页数:8
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