Merged electron-ion beam experiments. IV - Dissociative recombination for the methane group CH/+/,...,CH5/+/

Physics

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Beam Interactions, Gas Dissociation, Interstellar Gas, Interstellar Space, Ion Recombination, Methane, Cross Sections, Electron Beams, Electron Energy, Ion Beams

Scientific paper

The dissociative recombination of the methane-derived group, CH(+),...,CH5(+), has been measured over the centre-of-mass energy interval 0.03 to 2 eV. Assuming a Maxwellian distribution of the electron velocities, the derived rate coefficients for CH(+),...,CH5(+) at 100 K are, respectively, 5, 8.7, 12, 12.8 and 12.8 x 10 to the -7th cu cm/s. The recombination cross section for the diatomic ion CH(+) is large. This has far reaching consequences for the theories of molecular formation in interstellar clouds. The cross sections for the polyatomics CH(+),...,CH5(+) are also large and roughly equal in magnitude. Like CH(+) they exhibit a close to E to the -1st energy dependence below 0.1 eV. For CH3(+), CH4(+) and CH5(+) the slope of the cross sections increases above 0.1 eV.

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