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...

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Published inThe Astrophysical journal Vol. 463; no. 2; pp. L113 - L115
Main Authors Herbst, Eric, Woon, David E
Format Journal Article
LanguageEnglish
Published Ames Research Center IOP Publishing 01.06.1996
Subjects
Algorithms
Astronomical Phenomena
Astronomy
Computer Simulation
Exobiology
Extraterrestrial Environment
Hydrocarbons - chemistry
Hydrogen - chemistry
Ions
Isomerism
Models, Chemical
Space life sciences
Temperature
Non-Nasa Center
Nasa Discipline Exobiology
NASA Discipline Exobiology
Non-NASA Center
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Summary: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.
Bibliography:ARC
Ames Research Center
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1086/310059