ROTATIONAL ANALYSIS OF SUPERSONIC FREE JET SPECTRA OF THE $6^{1}_{0}$ BAND OF \v{A} $^{1}B_{2u}$, BENZENE

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1978

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Ohio State University

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Supersonic expansion of a benzene/helium mixture prepares benzene in the vibrationless ground state with only the lowest J=Kc rotational levels significantly populated. Laser excitation spectra are produced by crossing the free jet with a frequency-doubled, nitrogen laser-pumped dye laser that has a bandwidth of about 1 GHz in the ultraviolet. A comparison is made between molecular constants obtained by our study and those of the band contour analysis of Callomon, Dunn, and Mills1 Since spectra have been obtained using both continuous and pulsed supersonic expansion sources, a brief comparison of these techniques will be presented. A rotational analysis of the corresponding vibronic bands of the He-benzene and He2-benzene Van der Waals complexes will also be reported. In contrast to s-tetrazine, 2 the Van der Waals complexes of the excited state of benzene are less strongly bound than in the ground state.

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1 J. H. Callomon, T. M, Dunn, and I. M. Mills, Philos. Trans. R. Soc. Lond. A, 259, 499-532 (1966). 2 R. E. Smalley, L, Wharton, D. H. Levy, and D. W. Chandler, J. Chem. Phys. (in press) (1978).""


Author Institution: Department of Chemistry, Rice University,

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