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Optical Properties of Lattice Vibrations in Molecular Crystals
Author(s) -
Barentzen H.,
Schrader B.,
Merten L.
Publication year - 1971
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.2220450213
Subject(s) - van der waals force , lattice vibration , ionic crystal , ionic bonding , vibration , lattice (music) , molecule , thiourea , molecular physics , optical lattice , crystal (programming language) , materials science , molecular vibration , quartz , condensed matter physics , chemical physics , physics , chemistry , quantum mechanics , ion , phonon , superfluidity , organic chemistry , computer science , acoustics , programming language , composite material
A classical microscopic theory is presented for the optical properties of lattice vibrations in molecular crystals, which are composed of electrically neutral molecules bound by van der Waals forces. It is shown, that Huang's theory, which until now has been applied to ionic crystals only, is also valid for molecular crystals. Finally, oscillator strengths as well as LO and TO frequencies are calculated for thiourea according to the “oriented gas” model. A comparison shows, that the calculated oscillator strengths have the same order of magnitude as those of α‐quartz.