2002ApJ...578L..87S


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST04:34:03

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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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 928 2
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 942 3
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1939 1
4 NAME Ori 3N Cld 05 35 14.5 -05 19 30           ~ 7 0
5 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1057 1
6 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1851 1
7 EQ 185046.4+011114.0 MoC 18 53 18.8 +01 15 00           ~ 2 0
8 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 129 0
9 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 356 0
10 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 928 0
11 NGC 7538 OpC 23 13 37 +61 30.0           ~ 814 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-04:34:03

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