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Reaction of protons with methane in the Jovian ionosphere

Authors:	WT Huntress

Institution:	Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91103, U.S.A.

Abstract:	Laboratory data shows that the reaction of protons with methane proceeds at thermal ion energies to give both CH₃⁺ and CH₄⁺ ions in the ratio $CH_{3}^{+} CH_{4}^{+} = 1.5 ± 0.3$ . The overall rate constant for the reaction is 3.8 ± 0.3 × 10^?9 cm³/sec. This reaction may lead to the formation of hydrocarbon ions in the lower ionosphere of Jupiter, and the significance of this process for formation of hydrocarbons and HCN in the atmosphere of Jupiter is discussed.

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