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Experimental studies of the dissociative recombination processes for the C6D6+ and C6D7+ ions

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens ,
M. Hamberg ,
E. Vigren ,
R.D. Thomas ,
V. Zhaunerchyk ,
M. Zhang ,
S. Trippel ,
M. Kaminska  and
I. Kashperka
...Show all authors
M. Hamberg
Affiliation:
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. e-mail: mathias.hamberg@physto.se ;
E. Vigren
Affiliation:
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. e-mail: mathias.hamberg@physto.se ;
R.D. Thomas
Affiliation:
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. e-mail: mathias.hamberg@physto.se ;
V. Zhaunerchyk
Affiliation:
Radboud University Nijmegen, Institute for Molecules and Materials, PO Box 9010, 6500 GL Nijmegen, The Netherlands
M. Zhang
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Rd., Lanzhou 730000, China
S. Trippel
Affiliation:
Department of Physics, Albert-Ludwigs Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
M. Kaminska
Affiliation:
Jan Kochanowski University, Świȩtokrzyska 15, 25406 Kielce, Poland
I. Kashperka
Affiliation:
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. e-mail: mathias.hamberg@physto.se ;
M. af Ugglas
Affiliation:
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. e-mail: mathias.hamberg@physto.se ;
A. Källberg
Affiliation:
Manne Siegbahn Laboratory, Frescativägen 26, 114 18 Stockholm, Sweden
A. Simonsson
Affiliation:
Manne Siegbahn Laboratory, Frescativägen 26, 114 18 Stockholm, Sweden
A. Paál
Affiliation:
Manne Siegbahn Laboratory, Frescativägen 26, 114 18 Stockholm, Sweden
J. Semaniak
Affiliation:
Jan Kochanowski University, Świȩtokrzyska 15, 25406 Kielce, Poland
M. Larsson
Affiliation:
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. e-mail: mathias.hamberg@physto.se ;
W.D. Geppert
Affiliation:
Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden. e-mail: mathias.hamberg@physto.se ;

Abstract

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We have investigated the dissociative recombination (DR) of the C6D6+ and C6D7+ ions using the CRYRING heavy-ion storage ring at Stockholm University, Sweden. The dissociative recombination branching ratios were determined at minimal collision energy, showing that the DR of both ions was dominated by pathways keeping the carbon atoms together in one product. The absolute reaction cross sections for the titular ions are best fitted by σ(Ecm [eV]) = 1.3 ± 0.4 × 10-15 (Ecm [eV])−1.19 ± 0.02 cm2 (C6D6+) and σ(Ecm [eV]) = 1.1 ± 0.3 ×  10-15(Ecm [eV])−1.33 ± 0.02 cm2 (C6D7+) in the intervals 3-300 meV and 3-200 meV respectively. The thermal rate constants of the titular reactions are best described by: k(T) = 1.3 ± 0.4 × 10-6(T/300)−0.69 ± 0.02 cm3s-1 for C6D6+ and k(T) = 2.0 ± 0.6 × 10-6 (T/300)−0.83 ± 0.02 cm3s-1 for C6D7+. These expressions correlates well with earlier flowing afterglow studies on the same process.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 46: PAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis , 2011 , pp. 241 - 249
Copyright
© EAS, EDP Sciences 2011

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