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Covalency and Deformability of Ag + ‐Ions in the Lattice Dynamics of Silver Halides
Author(s) -
Fischer K.,
Bilz H.,
Haberkorn R.,
Weber W.
Publication year - 1972
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.2220540128
Subject(s) - halide , ion , silver halide , covalent bond , raman spectroscopy , shell (structure) , lattice (music) , coupling (piping) , chemistry , atomic physics , molecular physics , chemical physics , materials science , physics , nanotechnology , inorganic chemistry , optics , composite material , layer (electronics) , acoustics , organic chemistry
The lattice vibrations of the silver halides AgCl and AgBr have been investigated using a shell model with deformable ions. The deformability of the d‐shell of the Ag + ‐ion and its covalent coupling to the neighbours have been considered by introducing two new degrees of freedom in the electronic shell of the Ag + ‐ion. They are of quadrupolar (Γ 12 + ) and of rotational (Γ 15 + ) symmetry character. The calculations have been confirmed by comparison with the unpolarized Raman spectra of second order.