Open AccessExcitonic effects in x-ray transitions in metals
Author(s) -
Mahan Gd
Publication year - 1970
Publication title -
journal of research of the national bureau of standards. section a. physics and chemistry
Language(s) - Uncategorized
Resource type - Journals
eISSN - 2376-5704
pISSN - 0022-4332
DOI - 10.6028/jres.074a.022
Subject(s) - yukawa potential , physics , electron , singularity , condensed matter physics , oscillator strength , measure (data warehouse) , matrix (chemical analysis) , density of states , atomic physics , quantum mechanics , materials science , mathematical analysis , mathematics , database , computer science , composite material , spectral line
In the study of soft x-ray transitions in solids, there has always been some hope that the results provide a direct measure of the density of states. This assumes that (a) matrix element variations over the band and (b) final state interactions are small. Both of these assumptions are now known to be incorrect. To illustrate the possible strength of these effects, two approximate calculations are presented: the one electron oscillator strength of a simple bcc metal as a function of energy; and the strength of the Nozieres - DeDominicis singularity at threshold, with phase shifts estimated from an assumed Yukawa interaction between conduction electrons and core hole.