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X‐Ray Absorption Fine Structure Investigation of the High Pressure Phase of KBr and RbCl. Full Multiple Scattering Analysis
Author(s) -
Soldatov A. V.,
Ivanchenko T. S.,
Stekhin I. E.,
Bianconi A.,
Ingalls R.
Publication year - 1994
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.2221840121
Subject(s) - xanes , scattering , absorption edge , absorption (acoustics) , phase (matter) , chemistry , spectral line , photoelectric effect , k edge , analytical chemistry (journal) , absorption spectroscopy , atomic physics , molecular physics , materials science , optics , band gap , physics , optoelectronics , organic chemistry , chromatography , astronomy , composite material
X‐ray absorption near edge structure (XANES) of the Br and Rb K edge of the high pressure (B2) phase of KBr and RbCl is analyzed. A full multiple scattering method is used to investigate the conduction band structure of KBr and RbCl. Theoretical K‐edge absorption spectra obtained over a large energy interval are used to analyze the experimental data. As in the case of the low pressure (B1) phase, XANES is found to be determined by multiple scattering of photoelectrons in a large‐size cluster (30 atoms or more). For the energy interval up to 50 eV above the main edge, the single scattering approximation seems to be less satisfactory. A comparative analysis of XANES of the two compounds in two different crystal phases makes it possible to conclude on the role of the local symmetry around the absorbing site and the characteristics of the surrounding atoms in the formation of XANES and conduction band of the compounds investigated.