INTENSITY AND LINE WIDTH MEASUREMENTS IN THE $\nu_{4}$-FUNDAMENTAL OF $^{13}CH_{4}$ AT PLANETARY ATMOSPHERIC TEMPERATURES$^{\dag}$

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1988

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Ohio State University

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Observation of the spectral lines belonging to $^{13}CH_{4}$ and comparison of their intensities and collision-broadened half-widths with those of $^{1}CH_{4}$ are not only relevant to studies of planetary evolution and exploration but are also of sustained interest to rescarchers engaged in intensity perturbation and collision-broadening studies of tetrahedral molecules. We present results obtained at several temperatures between 100 and 295 K on P(4), P(5) and P(6) multiplets using a tunable diode laser and $H_{2}, He, Ar, N_{2}, O_{2}$ and air as broadening gases. The difference in the line widths of the three tetrahedral species of lines and their variation with temperature is also presented.

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$^{\dag}$ Supported by the Planetary Atmospheres Branch of the Solar System Exploration Division of NASA under Grant-in-Aid No. NGR 33-015-139.
Author Institution: Laboratory for Planetary Atmospheres Research, State University of New York

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