Branching fractions in the dissociative recombination of NH_4(+) and NH_2(+) molecular ions

Details Branching fractions in the dissociative recombination of NH_4(+) and NH_2(+) molecular ions Branching fractions in the dissociative recombination of NH_4(+) and NH_2(+) molecular ions

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344.1027v&link_type=abstract

Astronomy and Astrophysics, v.344, p.1027-1033 (1999)

Astronomy and Astrophysics

Astrophysics

26

Ism: Molecules, Ism: Clouds, Molecular Processes

Scientific paper

Branching fractions in the dissociative recombination of NH_4(+) and NH_2(+) molecular ions with electrons were measured using the CRYRING heavy ion storage ring. We have determined complete branching fractions for NH_4(+) at 0 eV and 2 meV collision energies, and at 0 eV collision energy for NH_2(+) . We found the dissociative recombination of NH_4(+) to be dominated by the two body, `ammonia' channel. The branching fractions we obtained at 0 eV are 0.69 +/- 0.03 for the NH_3 + H channel, and for the breakup into the NH_2 + H_2 and NH_2 + 2H channels 0.10 +/- 0.02 and 0.21 +/- 0.03, respectively. The values we obtained for 2 meV are about the same as at 0 eV. For the NH_2(+) ion we obtained 0.66 +/- 0.01 for the three body N + H + H channel, 0.34 +/- 0.02 for NH + H, and no breakup into the N + H_2 channel. Dissociative recombination of NH_4(+) and NH_2(+) is important as a potential source of some neutral molecules found in the interstellar clouds (NH_3, NH_2, and NH) and the measured branching fractions have important implications for modeling the chemistry of these clouds. We report also on the relative dissociative recombination cross sections for NH_4(+) and NH_2(+) for collision energies below 60 eV.

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