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Issue 5, 2004
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Dissociative recombination of C2H+ and C2H4+: Absolute cross sections and product branching ratios

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Abstract

Dissociative recombination (DR) of the hydrocarbon ions C2H+ and C2H4+ has been examined at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm, Sweden). Absolute DR cross sections were measured for center-of-mass collision energies between 1 meV and 0.1 eV for both ions, giving cross sections at 1 meV of 7.6 × 10−13 cm2 for C2H+ and 1.7 × 10−12 cm2 for C2H4+. The dissociative recombination branching ratios were determined at minimal collision energy, showing that the carbon bond is broken in 57% of the dissociative recombination events for C2H+, while this happens in only 7% of the events for C2H4+. In the case of C2H4+, three-particle breakup into C2H2 and 2H is the dominant product channel with a branching ratio of 66%. The present results are compared with previous DR measurements made at CRYRING for DR of C2H2+ and C2H3+.

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Article information


Submitted
18 Nov 2003
Accepted
14 Jan 2004
First published
29 Jan 2004

Phys. Chem. Chem. Phys., 2004,6, 949-954
Article type
Paper

Dissociative recombination of C2H+ and C2H4+: Absolute cross sections and product branching ratios

A. Ehlerding, F. Hellberg, R. Thomas, S. Kalhori, A. A. Viggiano, S. T. Arnold, M. Larsson and M. af Ugglas, Phys. Chem. Chem. Phys., 2004, 6, 949
DOI: 10.1039/B314882C

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