Some positive ion reactions with H2 - Interstellar implications

Details Some positive ion reactions with H2 - Interstellar implications Some positive ion reactions with H2 - Interstellar implications

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..377s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 377-384. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

39

Chemical Reactions, Hydrogen Atoms, Interstellar Chemistry, Positive Ions, Reaction Kinetics, Ammonia, Carbon, Chlorine, Hydrosulfites, Sulfur

Scientific paper

The rate coefficients for the reactions of NH3(+), Cl(+), S(+), SH(+) and C(2+) with H2 have been measured at various temperatures down to 80 K in a selected ion flow tube (SIFT) experiment. It is shown that the rate coefficient for the NH3(+) reaction does not reduce as rapidly with decreasing temperature as expected on the basis of previous data and so the problem of explaining NH3(+) production in interstellar clouds (ISC) is alleviated. Contrary to a recent postulate, the rate coefficient for the Cl(+) reaction does not decrease below the large value previously determined at room temperature and so the absence of HCl from ISC spectra remains uncertain. The collisional association of S(+) with H2 is immeasurably slow even at 80 K and therefore it is argued that radiative association does not produce H2S(+) in ISC. Also the C(2+) reaction does not generate CH(+) and does not therefore contribute to the production of CH(+) in diffuse ISC. Possible alternative sources of H2S and CH(+) in ISC are tentatively proposed.

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