A tentative interpretation for the difference in the abundance ratios HCO(+)/CO and HCS(+)/CS in interstellar space

Details A tentative interpretation for the difference in the abundance ratios HCO(+)/CO and HCS(+)/CS in interstellar space A tentative interpretation for the difference in the abundance ratios HCO(+)/CO and HCS(+)/CS in interstellar space

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339..231t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 1, 1989, p. 231-238. Research supported by CNRS.

Astronomy and Astrophysics

Astrophysics

28

Abundance, Formyl Ions, Interstellar Chemistry, Molecular Clouds, Carbon Monoxide, Dissociation, Ground State, Rydberg Series, Valence, Wave Functions

Scientific paper

It is shown here that the difference of two orders of magnitude between the values of the abundance ratios HCO(+)/CO and HCS(+)/CS in interstellar clouds can be directly related to the difference in the reaction rates of the dissociative recombination reactions of the positive ions. The potential energy curves of the systems (HCO+ + e-) and (HCS+ + e-) in Rydberg and dissociative valence states, as well as those of the positive ions CHO+ and HCS+, are computed by ab initio quantum chemistry methods. The potential surfaces of the two systems show striking differences, suggesting that the dissociative processes, direct and indirect, should be more efficient for HCO.

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