N2 and Ar broadening and line mixing in the P and R branches of the ν3 band of CH4.

Details N2 and Ar broadening and line mixing in the P and R branches of the ν3 band of CH4. N2 and Ar broadening and line mixing in the P and R branches of the ν3 band of CH4.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jqsrt..57..157p&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 57, issue 2, pp. 157-176

Computer Science

35

Methane: Line Broadening, Methane: Planetary Atmospheres

Scientific paper

N2- and Ar-broadened spectra of the allowed P- and R-branch manifolds for J ≤ 10 in the ν3 band of CH4, have been recorded from the Doppler limit to ≡67 kPa at T = 295 K using a tunable difference-frequency laser spectrometer. The broadening coefficients exhibit larger variations among the tetrahedral components in the R-branch manifolds than in the P branch. The broadenings for Ar are uniformly 88(1)% of those for N2. Line intensities, pressure shifts and Dicke narrowing coefficients are also obtained. Strong line mixing among the blended tetrahedral components is observed, and an analysis is presented restricting line coupling among transitions with the same nuclear spin A, E or F symmetry with the sum of the mixing coefficients for a given symmetry in a J manifold constrained to zero.

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