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Dissociative Recomb...
Dissociative Recombination of Protonated Formic Acid : Implications for Molecular Cloud and Cometary Chemistry
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- Vigren, Erik (author)
- Stockholms universitet,Fysikum
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- Hamberg, Mathias (author)
- Stockholms universitet,Fysikum
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- Zhaunerchyk, Vitali (author)
- Stockholms universitet,Fysikum
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Kaminska, Magdalena (author)
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Semaniak, Jacek (author)
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- Larsson, Mats (author)
- Stockholms universitet,Fysikum
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- Thomas, Richard D. (author)
- Stockholms universitet,Fysikum
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- af Ugglas, Magnus (author)
- Stockholms universitet,Fysikum
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- Kashperka, Iryna (author)
- Stockholms universitet,Fysikum
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Millar, T. J. (author)
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Walsh, Catherine (author)
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Roberts, Helen (author)
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- Geppert, Wolf D. (author)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- 2010
- 2010
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 709:2, s. 1429-1434
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- At the heavy ion storage ring CRYRING in Stockholm, Sweden, we have investigated the dissociative recombination of DCOOD2+ at low relative kinetic energies, from similar to 1 meV to 1 eV. The thermal rate coefficient has been found to follow the expression k(T) = 8.43 x 10(-7) (T/300)(-0.78) cm(3) s(-1) for electron temperatures, T, ranging from similar to 10 to similar to 1000 K. The branching fractions of the reaction have been studied at similar to 2 meV relative kinetic energy. It has been found that similar to 87% of the reactions involve breaking a bond between heavy atoms. In only 13% of the reactions do the heavy atoms remain in the same product fragment. This puts limits on the gas-phase production of formic acid, observed in both molecular clouds and cometary comae. Using the experimental results in chemical models of the dark cloud, TMC-1, and using the latest release of the UMIST Database for Astrochemistry improves the agreement with observations for the abundance of formic acid. Our results also strengthen the assumption that formic acid is a component of cometary ices.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- astrochemistry; molecular processes
- Chemical physics
- Kemisk fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Vigren, Erik
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Hamberg, Mathias
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Zhaunerchyk, Vit ...
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Kaminska, Magdal ...
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Semaniak, Jacek
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Larsson, Mats
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show more...
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Thomas, Richard ...
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af Ugglas, Magnu ...
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Kashperka, Iryna
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Millar, T. J.
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Walsh, Catherine
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Roberts, Helen
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Geppert, Wolf D.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Astrophysical Jo ...
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Stockholm University