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Experimental Studie...
Experimental Studies of (HCO+)-C-13 Recombining with Electrons at Energies between 2-50 000 meV
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- Hamberg, Mathias (author)
- Uppsala universitet,Stockholms universitet,Fysikum,Uppsala University, Sweden,Högenergifysik
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- Kashperka, Iryna (author)
- Stockholms universitet,Fysikum
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- Thomas, Richard D. (author)
- Stockholms universitet,Fysikum
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Roueff, Evelyne (author)
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- Zhaunerchyk, Vitali (author)
- Uppsala universitet,Stockholms universitet,Fysikum,Uppsala University, Sweden,Molekyl- och kondenserade materiens fysik
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- Danielsson, Mathias (author)
- Stockholms universitet,Fysikum
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- af Ugglas, Magnus (author)
- Stockholms universitet,Fysikum
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- Österdahl, Fabian (author)
- Stockholms universitet,Fysikum
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- Vigren, Erik (author)
- Stockholms universitet,Fysikum
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Kaminska, Magdalena (author)
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- Källberg, Anders (author)
- Stockholms universitet,Fysikum
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- Simonsson, Ansgar (author)
- Stockholms universitet,Fysikum
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- Paál, Andras (author)
- Stockholms universitet,Fysikum
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Gerin, Maryvonne (author)
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- Larsson, Mats (author)
- Stockholms universitet,Fysikum
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- Geppert, Wolf D. (author)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- 2014-07-24
- 2014
- English.
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In: Journal of Physical Chemistry A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 118:31, s. 6034-6049
- 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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- An investigation into the dissociative recombination process for (HCO+)-C-13 using merged ion-electron beam methods has been performed at the heavy ion storage ring CRYRING, Stockholm, Sweden. We have measured the branching fractions of the different product channels at similar to 0 eV collision energy to be the following: CO + H 87 +/- 2%, OH + C 9 +/- 2%, and O + CH 4 +/- 2%. The formation of electronically excited CO in the dominant reaction channel has also been studied, and we report the following tentative branching fractions for the different CO product electronic states: CO(X (1)Sigma(+)) + H, 54 +/- 10%; CO(a (3)Pi) + H, 23 +/- 4%; and CO(a' (3)Sigma(+)) + H, 23 +/- 4%. The absolute cross section between similar to 2-50 000 meV was measured and showed resonance structures between 3 and 15 eV. The cross section was fitted in the energy range relevant to astrophysics, i.e., between 1 and 300 meV, and was found to follow the expression sigma = 1.3 +/- 0.3 X 10(-16) E-1.29 +/- 0.05 cm(2) and the corresponding thermal rate constant was determined to be k(T) = 2.0 +/- 0.4 X 10(-7)(T/300)(-0.79 +/- 0.05) cm(3) s(-1). Radioastronomical observations with the IRAM 30 m telescope of HCO+ toward the Red Rectangle yielded an upper column density limit of 4 X 10(11) cm(-2) of HCO+ at the 1 sigma level in that object, indicating that previous claims that the dissociative recombination of HCO+ plays an important role in the production of excited CO molecules emitting the observed Cameron bands in that object are not supported.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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- art (subject category)
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Hamberg, Mathias
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Kashperka, Iryna
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Thomas, Richard ...
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Roueff, Evelyne
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Zhaunerchyk, Vit ...
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Danielsson, Math ...
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show more...
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af Ugglas, Magnu ...
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Österdahl, Fabia ...
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Vigren, Erik
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Kaminska, Magdal ...
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Källberg, Anders
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Simonsson, Ansga ...
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Paál, Andras
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Gerin, Maryvonne
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Larsson, Mats
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Geppert, Wolf D.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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Stockholm University
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Uppsala University