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Volume 133, 2006
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Dissociative recombination of protonated methanol

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The branching ratios of the different reaction pathways and the overall rate coefficients of the dissociative recombination reactions of CH3OH2+ and CD3OD2+ have been measured at the CRYRING storage ring located in Stockholm, Sweden. Analysis of the data yielded the result that formation of methanol or deuterated methanol accounted for only 3 and 6% of the total rate in CH3OH2+ and CD3OD2+, respectively. Dissociative recombination of both isotopomeres mainly involves fragmentation of the C–O bond, the major process being the three-body break-up forming CH3, OH and H (CD3, OD and D). The overall cross sections are best fitted by σ = 1.2 ± 0.1 × 10−15E−1.15±0.02 cm2 and σ = 9.6 ± 0.9 × 10−16E−1.20±0.02 cm2 for CH3OH2+ and CD3OD2+, respectively. From these values thermal reaction rate coefficients of k(T) = 8.9 ± 0.9 × 10−7 (T/300)−0.59±0.02 cm3 s−1 (CH3OH2+) and k(T) = 9.1 ± 0.9 × 10−7 (T/300)−0.63±0.02 cm3 s−1(CD3OD2+) can be calculated. A non-negligible formation of interstellar methanol by the previously proposed mechanism via radiative association of CH3+ and H2O and subsequent dissociative recombination of the resulting CH3OH2+ ion to yield methanol and hydrogen atoms is therefore very unlikely.

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Publication details

The article was received on 11 Nov 2005, accepted on 08 Feb 2006 and first published on 19 May 2006

Article type: Paper
DOI: 10.1039/B516010C
Citation: Faraday Discuss., 2006,133, 177-190
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    Dissociative recombination of protonated methanol

    W. D. Geppert, M. Hamberg, R. D. Thomas, F. Österdahl, F. Hellberg, V. Zhaunerchyk, A. Ehlerding, T. J. Millar, H. Roberts, J. Semaniak, M. af Ugglas, A. Källberg, A. Simonsson, M. Kaminska and M. Larsson, Faraday Discuss., 2006, 133, 177
    DOI: 10.1039/B516010C

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