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Title:
Laboratory measurements of the abundance ratio (HCO+)/((HOC+) and their astrophysical implications
Authors:
Amano, T.; Nakanaga, T.
Affiliation:
AA(National Research Council of Canada, Herzberg Institute of Astrophysics, Ottawa), AB(National Research Council of Canada, Herzberg Institute of Astrophysics, Ottawa)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 1, 1988, p. 373-379. (ApJ Homepage)
Publication Date:
05/1988
Category:
Atomic and Molecular Physics
Origin:
STI
NASA/STI Keywords:
Abundance, Astrophysics, Cosmochemistry, Formyl Ions, Interstellar Matter, Molecular Ions, Absorption Spectra, Carbon Monoxide, Gas Mixtures, Hollow Cathodes, Hydrogen
DOI:
10.1086/166299
Bibliographic Code:
1988ApJ...328..373A

Abstract

The relative intensity of the infrared absorption lines of HCO+ and HOC+ was measured as a function of the pressures of CO and H2. Under laboratory conditions, the isomerization process by CO was found to be a dominant depletion process of HOC+. A ratio of about 220 was obtained under the most favorable reaction conditions for production of HOC+. Although the rate constant of the catalytic isomerization of HOC+ by H2 is smaller than that of the isomerization reaction by CO by about an order of magnitude, the catalytic isomerization is the main depletion process of HOC+ in dense dark clouds. The estimated rate constants derived here give an estimated abundance ratio (HCO+)/(HOC+) of 10 million. These results imply that the dissociative recombination rate of H3+ is similar to that of most recombination processes.

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