Reassessment of the dissociative recombination of n2h+ at cryring
2012 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 757, no 1, 34- p.Article in journal (Refereed) Published
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.
astrochemistry, molecular processes
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-81844DOI: 10.1088/0004-637X/757/1/34ISI: 000309052800034OAI: oai:DiVA.org:su-81844DiVA: diva2:564097