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Anisotropy of the dielectric constants of trigonal selenium and tellurium between 3 and 30 eV
Author(s) -
Bammes P.,
Klucker R.,
Koch E. E.,
Tuomi T.
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.2220490218
Subject(s) - desy , anisotropy , photon energy , polarization (electrochemistry) , synchrotron radiation , tellurium , dielectric , photon , electron , atomic physics , perpendicular , materials science , optics , condensed matter physics , physics , chemistry , optoelectronics , nuclear physics , mathematics , metallurgy , geometry
The reflectivity of Se and Te single crystals has been measured at near normal incidence for photon energies between 3 and 30 eV with the electric field vector lying parallel and perpendicular to the c ‐axis of the crystals. The measurements were made using the polarized continuum of the synchrotron radiation of DESY. A Kramers‐Kronig analysis gave the optical constants for both directions of polarization. For both substances electron energy loss measurements are reported. Comparison with optical data gives satisfactory agreement. Even at high energies considerable anisotropic behaviour and several new spectral features are observed. They are discussed in terms of recent band structure calculations.