Destruction Rate of H_3^+ by Low-Energy Electrons Measured in a Storage-Ring Experiment

Details Destruction Rate of H_3^+ by Low-Energy Electrons Measured in a Storage-Ring Experiment Destruction Rate of H_3^+ by Low-Energy Electrons Measured in a Storage-Ring Experiment

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sci...263..785s&link_type=abstract

Science, Volume 263, Issue 5148, pp. 785-787

Physics

95

Scientific paper

Knowledge of the abundance of H_3^+ is needed in interstellar and planetary atmospheric chemistry. An important destruction mechanism of H_3^+ is low-energy electron impact followed by dissociation, but estimates of the reaction rate span several orders of magnitude. As an attempt to resolve this uncertainty, the cross section for dissociative recombination of vibrationally cold H_3^+ has been measured with an ion storage ring down to collision energies below 1 millielectron volt. A rate coefficient of 1.15 x 10-7 cubic centimeters per second at 300 kelvin was deduced. The cross section scaled with collision energy according to E-1.15, giving the rate a temperature dependence of T-0.65.

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