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Exciton reflection spectra of tetracene single crystals
Author(s) -
Kolendritskii D. D.,
Kurik M. V.,
Piryatinskii Yu. P.
Publication year - 1979
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.2220910243
Subject(s) - tetracene , exciton , crystal (programming language) , materials science , reflection (computer programming) , spectral line , single crystal , phase transition , phase (matter) , condensed matter physics , optics , crystallography , chemistry , physics , anthracene , photochemistry , organic chemistry , astronomy , computer science , programming language
Abstract The exciton reflection spectra of free tetracene single crystals and those in optical contact with different substrates (quartz, glass, muscovite) are measured in polarized light at temperatures ranging from 300 to 4.2 K. Peculiarities in the reflection spectra of a free crystal are due to a phase transition in the crystal at 160 K. The phase transition is shown to result from an increase of the crystal internal pressure due to the crystal stress with lowering temperature and leads to the change of the crystal symmetry. The b ‐polarized reflection spectra of free and in‐contact crystals show a structure which is related to the exciton effect in the surface region. A weak exciton‐phonon coupling in tetracene is concluded.