TWO-PHOTON FLUORESCENCE EXCITATION SPECTRUM OF BENZOTRIFLUORIDE
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Date
1984
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Ohio State University
Abstract
The $\widetilde{A}^{1}B_{2}-\widetilde{X}^{1}A_{1}$ two-photon fluorescence excitation spectrum of benzotrifluoride in the gas phase has been recorded and analysed in the total energy range of $37800 cm^{-1}$ to $40300 cm^{-1}$ using both linearly and circularly polarized light from a Nd-YAG pumped dye laser. The band system comprised of two groups, one group being unaffected and the other diminishing in intensity under circular polarization of the laser beam. The two-photon tensor patterns can be used to understand these behaviour. The intensity ordering of the bands in the two-photon spectrum is $14^{1}{_{o}}\gg 1^{1}{_{o}}> 0^{o}_{o}$ (Wilson numbering convention) while in one-photon spectrum the origin band is the strongest. The spectral features of benzotrifluoride are compared with fluorobenzene and toluene.
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Author Institution: Chemical Physics Group, Tata Institute of Fundamental Research