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The Valence Bond Approximation in Crystals — Application to an Analysis of the Ultraviolet Spectrum in Quartz
Author(s) -
Ruffa A. R.
Publication year - 1968
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.19680290210
Subject(s) - ultraviolet , quartz , valence (chemistry) , crystal (programming language) , valence electron , valence band , valence bond theory , electron , chemistry , materials science , molecular physics , atomic physics , physics , quantum mechanics , optoelectronics , computer science , composite material , programming language , atomic orbital
A simple band model analogous to the tight binding approximation is presented which is applicable to valence crystals. This model is applied to an analysis of the ultraviolet reflectivity data for quartz recently obtained by Loh and Philipp. It is demonstrated that the observed peaks can be understood in terms of the elementary processes of the breaking of Si‐O bonds, the promotion and demotion of atomic states, and the interaction with the crystal of electrons freed by these processes.