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Title:
Is interstellar acetone produced by ion-molecule chemistry?
Authors:
Herbst, Eric; Giles, Kevin; Smith, David
Affiliation:
AA(Duke University, Durham, NC), AB(Birmingham, University, England), AC(Birmingham, University, England)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 468-472. Research supported by SERC. (ApJ Homepage)
Publication Date:
08/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Acetone, Association Reactions, Interstellar Matter, Radiative Recombination, Interstellar Chemistry, Ion Concentration, Ionic Reactions, Reaction Kinetics
DOI:
10.1086/169000
Bibliographic Code:
1990ApJ...358..468H

Abstract

The rate coefficient for the ion-molecule radiative association reaction CH3(+) + CH3CHO - (CH3)2CHO(+) has bee calculated in the range 10-300 K with the phase-space techique and the aid of a laboratory measurement of the analogous three-body association at room temperature. It has been suggested by Combes et al. (1987) that this reaction followed by dissociative recombination is responsible for the observed abundance of acetone (CH3COCH3) in Sgr B2. However, it is shown here that the radiative association reaction is probably too slow even at 10 K to lead to the observed abundance of acetone in this source. The question of how acetone is produced in Sgr B2 is thus still unanswered.

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