THE FREQUENCY DEPENDENCE OF RAMAN SCATTERING OF BENZENE AND SOME RELATED COMPOUNDS IN THE ULTRAVIOLET

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1977

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Ohio State University

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The excitation wavelength dependence of the Raman intensities of several fundamental vibrational frequencies of benzene, toluene, fluorobenzene and m-xylene in carbon tetrachloride has been measured in a spectral region approaching the lowest lying absorption band in these molecules. Tunable UV laser radiation from 337 nm to 276 nm was used. Pre-resonance enhancement was observed for some modes and one example of anti-resonance was seen. These results are discussed within the framework of the vibronic theory of Raman scattering. Accordingly, forbidden electronic transitions (such as the $^{1}B_{2u}$ transition in benzene)are in active and Raman active electronic transitions may be identified. In general, good agreement is found between the observed pre-resonance effects and theory.

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This research was supported by a grant from the National Science Foundation and by the Materials Science Center, Cornell University.
Author Institution: Department of Chemistry, Cornell University

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