title: Calculations concerning the HCO+/HOC+ abundance ratio in dense interstellar clouds.
abstract: Calculations have been performed to determine the rate coefficients of several reactions involved in both the formation and depletion of 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 as to a more rapid depletion rate for HOC+.
authors.affiliation: Molecular Research Institute, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: DeFrees
authors.forename: A D
authors.initials: AD
authors.lastname: McLean
authors.forename: E
authors.initials: E
authors.lastname: Herbst
mesh_terms: D000447:Aldehydes / Q000032:analysis* / Q000737:chemistry; D055580:Astronomical Phenomena; D001256:Astronomy; D005118:Extraterrestrial Environment; D005557:Formaldehyde / Q000737:chemistry; D006838:Hydrocarbons / Q000032:analysis* / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D007536:Isomerism; D008958:Models, Molecular; D011789:Quantum Theory
chemical_list: D000447:Aldehydes; D006838:Hydrocarbons; D005557:Formaldehyde; D006859:Hydrogen