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Plasmons in CaSO 4
Author(s) -
Yaskolko V. Ya.
Publication year - 1994
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.2221860213
Subject(s) - plasmon , electron , spectral line , atomic physics , valence band , band gap , valence electron , surface plasmon , electronic band structure , physics , materials science , condensed matter physics , optics , nuclear physics , astronomy
With the help of optical loss spectra (OLS), energy loss spectra (ELS), and the dependence of stimulated electron emission on the energy of slow exciting electrons (ESEL), the true plasmon energies in CaSO 4 (13.5, 18.1,20.9 eV) are obtained and the energy gap is confirmed (12 eV). The subzones in the valence band where plasma oscillations occur are determined, as well as the number of electrons in one plasmon. The band structure for CaSO 4 is constructed and interband transitions are interpreted. From the data of CaSO 4 the plasmon energies, the energy gaps, etc. for the Sr, Ba, Pb sulphates are calculated.