Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483..531v&link_type=abstract
Astrophysical Journal v.483, p.531
Astronomy and Astrophysics
Astronomy
93
Methods: Laboratory, Molecular Processes
Scientific paper
Dissociative recombination of the polyatomic ions H2O+, H3O+, and {CH}^{+}3 with electrons has been measured at the heavy-ion storage ring ASTRID. Complete branching ratios for all the possible product channels have been determined at zero relative energy using an energy-sensitive detector masked by grids with known transmissions. In the dissociative recombination of H3O+, water molecules are produced with a probability of 33%, whereas the production of atomic oxygen is negligible. Atomic carbon is, on the other hand, produced with a branching ratio of 30% in the dissociative recombination of {CH}^{+}3 . For all three molecular ions, the three-particle breakup is a major process. Relative cross sections for dissociative recombination of H3O+ and for dissociative excitation of H3O+ have been measured for relative electron energies up to 40 eV. Implications for the modeling of the chemistry of interstellar molecular clouds are discussed.
Andersen Lars H.
Heber Oded
Kella D.
Pedersen H. B.
Schmidt Henning T.
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