Why HOC+ is detectable in interstellar clouds: the rate of the reaction between HOC+ and H2
The recent confirmation by Ziurys and Apponi of the detection of HOC+ toward Sgr B2 (OH), and their identification of the ion in Orion-KL and several other sources show that HOC+ is far more abundant than predicted by previous ion-molecule models. In these models, the reaction HOC(+) + H2 --> HCO(+) + H2 is assumed to rapidly destroy HOC+, based on the results of a prior calculation. We have recalculated the rate of this reaction as a function of temperature using a new ab initio potential surface and a phase space approach to the dynamics which includes tunneling. The newly calculated rate is small (< or = 1 x 10(-10) cm3 s-1) at temperatures under 100 K.
Herbst
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Department of Physics, The Ohio State University, Columbus 43210-1106, USA. herbst@ohstpy.mps.ohio-state.edu
Woon
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D000465:Algorithms; D055580:Astronomical Phenomena; D001256:Astronomy; D003198:Computer Simulation; D005118:Extraterrestrial Environment; D006838:Hydrocarbons / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D007477:Ions; D007536:Isomerism; D008956:Models, Chemical; D013696:Temperature
D006838:Hydrocarbons; D007477:Ions; D006859:Hydrogen