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Dissociative Recombination Measurements of Chloronium Ions (D2Cl+) Using an Ion Storage Ring
Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany.;Columbia Univ, Columbia Astrophys Lab, 538 W 120th St, New York, NY 10027 USA..
Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany.;Weizmann Inst Sci, Fac Phys, IL-76100 Rehovot, Israel..
Stockholm Univ, Dept Phys, AlbaNova, SE-10691 Stockholm, Sweden..
Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany..
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2018 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 862, no 2, article id 166Article in journal (Refereed) Published
Abstract [en]

We report our plasma rate coefficient and branching ratio measurements for dissociative recombination (DR) of D2Cl+ with electrons. The studies were performed in a merged-beams configuration using the TSR heavy-ion storage ring located at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. Starting with our absolute merged-beams recombination rate coefficient at a collision energy of approximate to 0 eV, we have extracted the cross section and produced a plasma rate coefficient for a translational temperature of approximate to 8 K. Furthermore, extrapolating our cross-section results using the typical low-energy DR behavior, we have generated a plasma rate coefficient for translational temperatures from 5 to 500 K. We find good agreement between our extrapolated results and previous experimental DR studies on D2Cl+. Additionally, we have investigated the three fragmentation channels for DR of D2Cl+. Here we report on the dissociation geometry of the three-body fragmentation channel, the kinetic energy released for each of the three outgoing channels, the molecular internal excitation for the two outgoing channels that produce molecular fragments, and the fragmentation branching ratios for all three channels. Our results, in combination with those of other groups, indicate that any remaining uncertainties in the DR rate coefficient for H2Cl+ appear unlikely to explain the observed discrepancies between the inferred abundances of HCl and H2Cl+ in molecular clouds and predictions from astrochemical models.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2018. Vol. 862, no 2, article id 166
Keywords [en]
astrochemistry, ISM: clouds, ISM: molecules, methods: laboratory: molecular, molecular data, molecular processes
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-364916DOI: 10.3847/1538-4357/aacefcISI: 000440726900004OAI: oai:DiVA.org:uu-364916DiVA, id: diva2:1262037
Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2018-11-09Bibliographically approved

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Hamberg, Mathias

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