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Issue A&A Volume 391, Number 3, September I 2002 Page(s) 1159 - 1165 Section Physical and chemical processes DOI 10.1051/0004-6361:20020882

A&A 391, 1159-1165 (2002)
DOI: 10.1051/0004-6361:20020882

Dissociative recombination of C

S. Kalhori¹, A. A. Viggiano², S. T. Arnold², S. Rosén¹, J. Semaniak³, A. M. Derkatch¹, M. af Ugglas⁴ and M. Larsson<sup>1

1</sup>  Department of Physics, Stockholm University, SCFAB, 106 91 Stockholm, Sweden
²  Air Force Research Laboratory, Space Vehicles Directorate, 29 Randolph Rd, Hanscom AFB, MA 01731, USA
    e-mail: Albert.Viggiano@hanscom.af.mil
³  Institute of Physics, Swietokrzyska Academy, 25-406 Kielce, Poland
    e-mail: jacek@pu.kielce.pl
⁴  Manne Siegbahn Laboratory, Stockholm University, 104 05 Stockholm, Sweden
    e-mail: ugglas@msi.se

(Received 23 April 2002 / Accepted 10 June 2002)

Abstract
We have studied the vibrationally relaxed C ₂H ₃⁺ ion in the heavy - ion storage ring CRYRING in Stockholm. We measured the dissociative recombination absolute cross section over center-of-mass energies in the range between 0 and 0.1 eV by scanning the electron energy.

The rate of different neutral product channels of dissociative recombination was measured. We found the three-body channel C ₂H + H + H, with a branching ratio of 59%, to be the dominant one. Finally, we compare C ₂H ₃⁺ and C ₂H ₂⁺ (Derkatch et al. 1999) results.

Key words: molecular processes -- ISM: molecules -- ISM: clouds

Offprint request: S. Kalhori, shiri@physto.se

© ESO 2002

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