HIGH RESOLUTION STIMULATED RAMAN SPECTROSCOPY OF THE $\nu_{1}$ BAND OF $CH_{4}$

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1978

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Ohio State University

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A Doppler limited CW stimulated Raman spectrum was taken of the $\nu_{1}$ band of methane. This is the first spectrum which clearly shows the Q- branch fine structure. We present line assignments for $J\leq 9$ and spectroscopic constants which differ significantly from previous $^analyses^{1,2}$ In particular, using $Hecht’s^{3}$ notation, we find that the rotational constant $B^{\prime} - B^{\circ}$ is $\Delta B =0.0109\pm 0.0003$ and the tensor splitting constant $t^{\prime}_{044}-t^{\circ}_{044}$ is $\Delta t_{044}=-(3.7 \pm 0.6)\times 10^{-5}$.

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$^{1}$W.R.L. Clements and B. P. Stoicheff, J. Mol. Spectrosc. 33, 183 (1970). $^{2}$M. R. Aliev, D. N, Koslov, and V. V. Smirnov, JETP Letters 26, 31 (1977). $^{3}$Karl T. Hecht, J. Mol. Spectrosc. 5, 355 (1960).""
Author Institution: Los Alamos Scientific Laboratory; Sandia Laboratories

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