The two-photon fluorescence excitation spectrum of dibenzothiophene

Year: 1981

Authors: Castellucci E., Foggi P., Salvi P.R.

Autors Affiliation: Istituto di Chimika Fisica, Università di Firenze, 50121 Firenze, Italy

Abstract: The two-photon fluorescence excitation spectra of dibenzothiophene crystal (˜77 K) and solution have been investigated in the spectral region 30000-38000 cm-1 (˜3350-2600 Å). Two electronic transitions have been found. Both the oriented gas model results applied to the crystal and the circular/linear polarization ratio to the solution claim for an 1A1 ? 1A1 assignment of the transitions. Not completely resolved vibronic structures in the crystal spectrum were observed for both transitions for which a tentative assignment to A1 total symmetry is discussed. It has been found that the intensity of the first electronic band system arises not only from a purely electronic (i.e., Franck-Condon) mechanism, but also from its interaction with a higher state through totally symmetric vibrations.

Journal/Review: CHEMICAL PHYSICS

Volume: 63 (3)      Pages from: 437  to: 443

KeyWords: dibenzothiophene
DOI: 10.1016/0301-0104(81)87018-8

Citations: 13
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