HOC+ + H2 Isomerization Rate at 25K: Implications on the Observed [HCO+]/[HOC+] Ratios in the Interstellar Medium

Details HOC+ + H2 Isomerization Rate at 25K: Implications on the Observed [HCO+]/[HOC+] Ratios in the Interstellar Medium HOC+ + H2 Isomerization Rate at 25K: Implications on the Observed [HCO+]/[HOC+] Ratios in the Interstellar Medium

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4710s&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #47.10; Bulletin of the American Astronomical Society, Vol. 34, p.1179

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent detection of the metastable HOC+ isomer toward a wide range of interstellar environments has demonstrated abundances which cannot be explained within current chemical models. The abundance of HOC+ in these models relies heavily upon the rate of isomerization of HOC+ by H2 to the lowest energy isomer, HCO+. A variable temperature 22-pole ion trap apparatus is employed to study the isomerization of HOC+ by H2 at 25 K. The observed rate coefficient for isomerization is (3.8 +/- 0.5) x 10-10 cm3 s-1. This indicates that there is probably no temperature dependence in this reaction below 300 K, suggesting the absence of any significant energetic barrier on the lowest adiabatic H3CO+ potential surface. This result argues that in regions where abundant HOC+ is observed, the production of this isomer must be strongly favored or that there is a concomitant rapid physicochemical loss for the isomer HCO+. Some results for forming DCO+ are briefly mentioned.

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