Pressure broadening and shift coefficients for H2, He and N2 in the 3ν2 band of 12CH3D retrieved by a multispectrum fitting technique.

Details Pressure broadening and shift coefficients for H2, He and N2 in the 3ν2 band of 12CH3D retrieved by a multispectrum fitting technique. Pressure broadening and shift coefficients for H2, He and N2 in the 3ν2 band of 12CH3D retrieved by a multispectrum fitting technique.

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jqsrt..63...49b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 63, issue 1, pp. 49-84

Computer Science

12

Methane: Line Broadening, Methane: Jovian Planets, Jovian Planets: Deuterium

Scientific paper

Improved determinations of CH3D abundances, as well as of the deuterium to hydrogen ratio (D/H) in the atmospheric methane of Saturn, Uranus, Neptune and Titan are reachable with a complete set of spectroscopic parameters for the 3ν2 band of 12CH3D which take into account the dominant gases in these atmospheres (i.e. H2, He and N2). Line intensities and self-broadening coefficients derived from a previous analysis made by the authors for 255 lines in the region of the 3ν2 band of 12CH3D at 1.55 μm have been recently reported. In this paper the authors present 12CH3D line broadening coefficients and pressure-induced shifts by H2, He and N2. A set of Fourier transform spectra recorded at Kitt Peak National Observatory with pressures of 100, 250 and 500 Torr for H2 and N2, and 600 Torr for He, has been used for this study. Data reduction was performed using a non-linear least-squares fitting multispectrum program developed for this purpose. The broadening coefficients, averaged over K, range roughly between 0.0685 and 0.0569 cm-1atm-1 for 12CH3D-H2, between 0.0434 and 0.0335 cm-1atm-1 for 12CH3D-He, and between 0.0665 and 0.0533 cm-1atm-1 for 12CH3D-N2, up to a maximum J of 14. The uncertainties are estimated to about 1.5% in the H2 and N2 broadening cases, and 3% in the He case. The pressure shift coefficients averaged over both J and K are found to be -0.0067 cm-1atm-1 for 12CH3D-H2, +0.0021 cm-1atm-1 for 12CH3D-He, and -0.0119 cm-1atm-1 for 12CH3D-N2. The authors estimate an uncertainty in these average shift coefficients of 15% in the H2 and N2, broadening cases, and of 35% in the He case. Dependences in J and K for these parameters have also been investigated with empirical expressions.

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