Calculations concerning the HCO(+)/HOC(+) abundance ratio in dense interstellar clouds

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Molecular Ions, Electron Tunneling, Quantum Chemistry, Reaction Kinetics

Scientific paper

Calculations have been performed to determine the rate coefficients of several reactions involved in both the formation and depletion if interstellar HCO+ and HOC+. The abundance of HOC+ deduced from these calculations is consistent with the tentative identification of HOC+ in Sgr B2 by Woods et al. The large HCO+/HOC+ abundance ratio observed by Woods et al. is due at least in part to a more rapid formation rate for HCO+ and probably due as well to a more rapid depletion rate for HOC+.

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