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Absence of the Gap in the Optical Excitation Spectrum of TCNQ Salts with Methyl Derivatives of Pyridinium
Author(s) -
Vainrub A. M.,
Zavt G. S.,
Graja A.
Publication year - 1989
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.2221550113
Subject(s) - pyridinium , excitation , dispersion (optics) , chemistry , dielectric , pyridinium compounds , band gap , spectrum (functional analysis) , dielectric function , charge (physics) , condensed matter physics , materials science , medicinal chemistry , optics , optoelectronics , physics , quantum mechanics
Abstract It is shown that the dispersion of the real and imaginary parts of the dielectric function of the TCNQ salts with methyl derivatives of pyridinium gives important information about the density of electronic states. It leads to the conclusion that a gap is not present in the optical excitation spectrum of the salts. It is shown that the model of the localized charge oscillations in dimers is inadequate for the salts.