ROTATIONALLY RESOLVED NEAR-INFRARED SPECTRUM OF HCBr

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1996

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Ohio State University

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The Rotationally resolved spectrum of bromomethylece (HCBr) in the vicinity of $12800 cm^{-1}$ was obtained at Doppler limited resolution using a transient frequency-modulation absorption technique. In contrast to the better studied halomethylence (HCF and HCCI), the number of experimentalo investigations on HCBr is very limited. Xu $et al.^{a}$ reported the $\tilde{A}\leftarrow \tilde{X} $ spectrum at visible wavelengths, but no rotational structure was resolved. Gilles $et al.^{b}$ have used photoelectron specroscopy to determined the singlet-triplet seperation to be 2.6$\pm$2.2 k.cal/mol. Based upon previous $studies^{a.b}$, we tentatively assign the observed band to be the $\tilde{A}^{1}A^{\prime\prime}(0,2,0)\leftarrow \tilde{X}^{1}A^{\prime}(0,0,0)$ transition. The analysis of the observed spectrum will be discussed. Acknowledgment: This work was carried out under Contrct no. De-AC02-76CH00016 with the U.S. Department of Energy and supported by its Division of Chemical sciences, Office of basic Energy Sciences.

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$^{a}$S, Xu, K, A, Beran, and M. D. Harmony, J. Phys. Chem. 98, 2742(1994). $^{b}$M.K. Gilles, K. M. Ervin, J. Ho, and W. C Lineberger, J. Phys. Chem, 96, 1130 (1992)
Author Institution: Department of Chemistry, Brookhaven National laboratory

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