# 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 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. URI: http://hdl.handle.net/1811/9495 Other Identifiers: 1975-TG-05