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Reassessment of the dissociative recombination of n2h+ at cryring
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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2012 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 757, no 1, 34- p.Article in journal (Refereed) Published
Abstract [en]

The dissociative recombination (DR) of N2H+ has been reinvestigated at the heavy ion storage ring CRYRING at the Manne Siegbahn Laboratory in Stockholm, Sweden. Thermal rate coefficients for electron temperatures between 10 and 1000 K have been deduced. We show that electron recombination is expected to play an approximately equally important role as CO in the removal of N2H+ in dark interstellar clouds. We note that a deeper knowledge on the influence of the ions' rotational temperature in the DR of N2H+ would be helpful to set further constraints on the relative importance of the different destruction mechanisms for N2H+ in these environments. The branching fractions in the DR of N2H+ have been reinvestigated at similar to 0 eV relative kinetic energy, showing a strong dominance of the N-2 + H production channel (93(-2)(+4)%) with the rest leading to NH + N. These results are in good agreement with flowing afterglow experiments and in disagreement with an earlier measurement at CRYRING.

Place, publisher, year, edition, pages
2012. Vol. 757, no 1, 34- p.
Keyword [en]
astrochemistry, molecular processes
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-81844DOI: 10.1088/0004-637X/757/1/34ISI: 000309052800034OAI: oai:DiVA.org:su-81844DiVA: diva2:564097
Note

AuthorCount:9;

Available from: 2012-11-01 Created: 2012-11-01 Last updated: 2017-12-07Bibliographically approved

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Vigren, ErikZhaunerchyk, Vitaliaf Ugglas, MagnusLarsson, MatsThomas, RichardGeppert, Wolf D.
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