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Multiple scattering approach to the XANES theory of alkali halide crystals. I. Crystalline potential in the X‐Ray absorption spectra problem
Author(s) -
Bugaev L. A.,
Gegusin I. I.,
Datsyuk V. N.,
Novakovich A. A.,
Vbdbinskii R. V.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221330123
Subject(s) - halide , scattering , ion , xanes , alkali metal , chemistry , crystal (programming language) , absorption spectroscopy , perfect crystal , electron , spectral line , atomic physics , molecular physics , physics , quantum mechanics , inorganic chemistry , crystallography , vacancy defect , computer science , programming language , organic chemistry
Two schemes of the crystalline potential for the slow electron in the conduction band of alkalihalides are proposed. The first one (semiempirical) is based on the assumption that in the case of an ion in the crystal one can use the same energy dependence of logarithmic derivatives (of radial solutions at the atomic sphere radius) as in the case of the isolated ion. The modifications required consist in some potential corrections, that are due to the Madelung field as well as to the relaxation and polarization response for both, hole and electron. The second model (ab initio) suggests the straightforward solution of Poisson's equation. Both approaches are compared, so it is found that they lead to satisfactory agreement for a wide energy interval in the continuum.