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Triplet absorption of crystalline anthracene by high resolution photoconductivity spectroscopy
Author(s) -
Fort A.,
Coret A.
Publication year - 1977
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.2220830228
Subject(s) - anthracene , photoconductivity , exciton , absorption spectroscopy , spectroscopy , lattice (music) , spectral line , molecule , molecular electronic transition , lattice vibration , materials science , molecular physics , atomic electron transition , chemistry , photochemistry , atomic physics , physics , condensed matter physics , optoelectronics , optics , phonon , organic chemistry , quantum mechanics , astronomy , acoustics
The photoconductivity spectrum of anthracene crystals at 4 K is studied with a cw dye laser in the spectral region corresponding to triplet exciton creation. Photocarriers are created by the detrapping of charges by excitons. This spectrum is complex but shows the different vibronic excitations which correspond to the purely electronic transition S 0 → T 1 coupled with different totally symmetrical vibration modes of the molecule. Lattice vibration modes also appear. The spectrum confirms the value of the Davydov splitting for the 0–0 transition and the broadening of the lines for the 0–1 and 0–2 transitions. The presence of satellite lines shows the formation of triplets on disturbed sites of the lattice.