Abstract
Using the technique of two-photon fluorescence excitation, the à 1B2–X̃ 1A1 electronic system of benzotrifluoride (α-trifluorotoluene) was recorded and analyzed employing both linearly and circularly polarized laser beam. The band system is comprised of two groups, one group being unaffected and the other diminishing in intensity under circular polarization of the laser beam. These behavior patterns can be rationalized on the basis of the two-photon tensor patterns. The intensity ordering of the bands in the two-photon spectrum is 1410≫110>000 (Wilson numbering convention) while in the one-photon spectrum the origin band is the strongest. The spectral features of benzotrifluoride are compared with fluorobenzene and toluene.
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