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Charge Transfer and Electron‐Molecular Vibration Coupling in Tetramerized Quasi‐lD Semiconductors
Author(s) -
Yartsev V. M.
Publication year - 1984
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.2221260209
Subject(s) - tetramer , semiconductor , eigenfunction , electron , excitation , atomic physics , molecule , molecular vibration , molecular physics , vibration , chemistry , polaron , coupling (piping) , ion , normal mode , electron transfer , eigenvalues and eigenvectors , materials science , physics , quantum mechanics , biochemistry , organic chemistry , metallurgy , enzyme
Electron‐molecular vibration coupling in tetramerized organic ion‐radical semiconductors is considered. Eigenvalues and eigenfunctions of the molecular tetramer with two electrons are calculated in terms of extended Hubbard model parameters. The energy inequivalence of the monomer sites is introduced explicitly. The complex frequency dependent conductivity of the tetramerized compounds is found to produce a number of sharp maxima due to indirect excitation of the totally symmetric (a g ) internal molecular modes of vibrations. These peaks are shown to have a fine structure if the charge density is not shared equally by the constituent molecules. The calculated reflectance is compared with the measured one for TEA (TCNQ) 2 single crystals.