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Optical Constants and Electronic Structure of Crystalline and Amorphous As 2 S 3 in the 3 to 35 eV Range
Author(s) -
Perrin J.,
Cazaux J.,
Soukiassian P.
Publication year - 1974
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.2220620202
Subject(s) - amorphous solid , valence (chemistry) , anisotropy , valence electron , materials science , range (aeronautics) , dielectric , condensed matter physics , atomic physics , molecular physics , electron , chemistry , physics , optics , crystallography , optoelectronics , quantum mechanics , composite material
By Kramers‐Kronig analysis, the complex dielectric constant tensor of monocrystalline As 2 S 3 is deduced from energy losses in the 3 to 35 eV range suffered by a 40 keV electron beam. The weak optical anisotropy observed in this spectral range is explained and the results are discussed in terms of a valence bonding model with two groups of valence bands. Upon the amorphous to crystalline transition it is the optical transitions originating in the resonance bonds which are only influenced.