Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284l..13s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. L13-L16. USAF-supported rese
Physics
97
Cosmochemistry, Dissociation, Interstellar Matter, Molecular Ions, Recombination Coefficient, Formyl Ions, Hydrogen Ions, Molecular Clouds
Scientific paper
The results obtained from a recent laboratory study of the dissociative recombination coefficients, alpha, at 95 and 300 K for the important interstellar ions H3(+), HCO(+), N2H(+) and CH5(+). The most important result of the study is that alpha-H3(+) is much smaller than previous studies had indicated, so small that it was only possible to obtain an upper limit value at both temperatures. However, the values of alpha-HCO(+), alpha-N2H(+) and alpha-CH5(+) have been determined at both temperatures, and they are in accordance with expectations based on previous laboratory data. The smaller alpha-H3(+) implies a larger fractional ionization of dense interstellar clouds than previous estimates had indicated. Some possible consequences of a higher ionization density to the physics and chemistry of dense clouds are mentioned.
Adams Nigel G.
Smith Douglas
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