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The dielectric function of GeS single crystals determined by electron energy loss spectroscopy
Author(s) -
Venghaus H.,
Büchner U.
Publication year - 1975
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.2220720217
Subject(s) - electron , electron energy loss spectroscopy , anisotropy , isotropy , dielectric function , atomic physics , spectroscopy , spectral line , dielectric , momentum (technical analysis) , chemistry , physics , condensed matter physics , optics , quantum mechanics , finance , economics
Abstract Electron energy loss spectra were taken with 50 keV electrons on GeS single crystals for 0 < E < 40 eV and with different orientations of transferred momentum. No anisotropy of the energy loss functions Im (–1/ϵ ii ) ( i = x, y, z ) could be observed indicating ϵ xx ≈ ϵ yy ≈ ϵ zz for E 3 eV. ϵ xx is calculated from Im (–1/ϵ xx ) by Kramers‐Kronig analysis. Our results indicate that the dielectric function of GeS is, to a good approximation, isotropic for E > 3 eV despite the layer type structure of the compound.