# THE Q-BRAHCH OF THE FORBIDDEN ROTATIONAL SPECTRUM OF $^{12}CH_{4}$

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 Title: THE Q-BRAHCH OF THE FORBIDDEN ROTATIONAL SPECTRUM OF $^{12}CH_{4}$ Creators: Holt, C. W.; Gerry, Michael C. L.; Ozier, I. Issue Date: 1975 Publisher: Ohio State University Abstract: The Q branch of the pure rotational spectrum of $^{12}CH_{4}$ in the ground vibronic state has been studied from 8 to 20 GHz with a conventional Stark microwave spectrometer employing a signal averager. This spectrum is very weakly allowed through the centrifugal distortion electric dipole moment. The detection of four lines between 8 and 18 GHz using a backward-wave oscillator source has been previously $reported.^{1}$ Three new lines have now been observed above 18 GHz with a klystron system. The seven microwave frequencies have been combined with three Q branch splittings available from double $resonance^{2}$ and molecular $beam^{3}$ work to determine the quartic, sextic and octic distortion constants of $^{12}CH_{4}$. The six constants obtained will be compared with those determined by other $workers,^{2,4}$. The spectrometer used will be described briefly. Description: $^{1}$ C. W. Holt, M.C.L. Gerry, and I. Ozier, Phys. Rev. Lett. 31, 1033 (1973). $^{2}$ R. F. Curl, J. Mol. Spectrosc. 48, 165 (1973). $^{3}$ I. Ozier, Phys. Rev. Lett. 27, 1329 (1971) and unpublished data. $^{4}$ G. Tarrago, M. Dang-Nhu, and G. Poussigue, C. R. Acad. Sci. (Paris) 278B, 207 (1974)."" Author Institution: Department of Chemistry, The University of British Columbia; Department of Physics, The University of British Columbia URI: http://hdl.handle.net/1811/9495 Other Identifiers: 1975-TG-05