ANALYSIS OF THE $7.7\mu$m BAND OF METHANE FOR JUPITER'S ATMOSPHERE

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 Title: ANALYSIS OF THE $7.7\mu$m BAND OF METHANE FOR JUPITER'S ATMOSPHERE Creators: Maguire, W. C.; Fox, K.; Jennings, D. E.; Thompson, R. H. Issue Date: 1979 Publisher: Ohio State University Abstract: Computations of vibration-rotation lines of the $\nu_{4}$ band of $^{12}CH_{4}$ at $1300 cm^{-1}$ have been extended to sixth order in perturbation theory. We have fit, by a least squares technique, a $0.04 cm^{-1}$ resolution laboratory spectrum obtained by Reisfeld $et al.^{1}$ at Los Alamos. We have assigned quantum numbers for approximately 250 lines in the $1200-1400 cm^{-1}$ region. The fourth order rotational constants of Husson and $Poussigue,^{2}$ derived from a lower resolution $spectrum,^{3}$ were used as starting values for the parameter search. We have calculated an improved fourth order fit to the spectrum and have also obtained parameters for a sixth order fit. The line strengths adopted here are consistent with the recent work of Fox $et al.^{4}$ Two examples of the application of this worm are given. First, a recent laser diode measurement in the $1200-1215 cm^{-1}$ region is compared to the theoretical spectrum. Second, the work is used to interpret spectra of Jupiter’s atmosphere obtained earlier this year with the infrared spectrometer on the Voyager spacecraft. Description: $^{1}$M. J. Reisfeld, J. D. King, H. Flicker and R. S. McDowell, private communication (1978). $^{2}$N. Husson and G. Poussigue, J. de phys. 32, 859 (1971). $^{3}$J. Botineau, J. Mol. Spec. 41, 182 (1971). $^{4}$K. Fox, M. J. Reisfeld and R. S. McDowell, 34th Symposium on Molecular Spectroscopy (1979). Author Institution: URI: http://hdl.handle.net/1811/11029 Other Identifiers: 1979-TE-13