31st Annual Meeting of the DPS, October 1999
Session 50. Labratory Results Posters
Poster Group II, Thursday-Friday, October 14, 1999, , Kursaal Center

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[50.03] Low-Temperature Rates for the Relaxation of Methane by Helium

B.P. Michael (NASA-NRC/GSFC), J.E. Allen Jr. (NASA/GSFC)

Energy transfer rates at low temperatures are important parameters for models of planetary atmospheres. However, the data simply have not been available or do not extend to the low temperatures found in the atmospheres of many of the planets and their satellites. Because methane plays an especially important role in the Jovian atmosphere, we have recently extended the data of Perrin and Jolicard (1986), to temperatures less than 100 K using the photoacoustic technique. Comparison of the data with results from the Landau-Teller approximation and the Schwartz, Slawsky and Herzfeld (SSH) theory show that these predictions can be in error by more than several orders of magnitude.

Perrin, M.Y. and Jolicard, G. 1986, {\em Chem Phys. Lett.} {\bf127}, 118.

{\em Support from NASA's Planetary Atmospheres Program through the National Research Council is gratefully acknowledged}.

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