SIMBAD references

2002ApJ...578L..87S - Astrophys. J., 578, L87-L90 (2002/October-2)

HOC+ + H2Isomerization rate at 25 K: implications for the observed [HCO+]/[HOC+] ratios in the interstellar medium.

SMITH M.A., SCHLEMMER S., VON RICHTHOFEN J. and GERLICH D.

Abstract (from CDS):

The recent detection of the metastable HOC+ isomer toward a wide range of interstellar environments has demonstrated abundances that cannot be explained within current chemical models. The abundance of HOC+ in these models relies heavily on the rate of the isomerization of HOC+ by H2to the lowest energy isomer, HCO+. A variable temperature 22-pole ion-trap apparatus is employed to study the isomerization of HOC+ by H2at 25 K. The observed rate coefficient for isomerization is (3.8±0.5)x10–10 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.

Abstract Copyright:

Journal keyword(s): Astrochemistry - ISM: Molecules - Methods: Laboratory - Molecular Processes

CDS comments: G34.3 = EQ 185046.4+011114.0

Simbad objects: 11

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