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Rotational excitation of small carbon chains by collisions withHe in the ISM

Published online by Cambridge University Press:  13 February 2013

A. Spielfiedel ,
F. Dayou ,
F. Dumouchel ,
N. Feautrier ,
F. Lique  and
M.-L. Senent
A. Spielfiedel
Affiliation:
LERMA – UMR 8112, Observatoire de Paris, 5 place Jules Janssen, Meudon, France
F. Dayou
Affiliation:
LERMA – UMR 8112, Observatoire de Paris, 5 place Jules Janssen, Meudon, France
F. Dumouchel
Affiliation:
LOMC – UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 540, 76058 Le Havre, France
N. Feautrier
Affiliation:
LERMA – UMR 8112, Observatoire de Paris, 5 place Jules Janssen, Meudon, France
F. Lique
Affiliation:
LOMC – UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 540, 76058 Le Havre, France
M.-L. Senent
Affiliation:
Departmento de Fisica y Quimica Teóricas, Instituto de Estructura de la Materia, CSIC, Calle Serrano 121, 28006 Madrid, Spain

Abstract

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Modeling of molecular emission from interstellar clouds requires the calculation of ratecoefficients for excitation by collision with the most abundant species. Based on newhighly correlated potential energy surfaces, rotational excitation of C2H andC2H− radicals in collision with He are investigated.C2H fine and hyperfine structure is taken into account. As already found forother systems, rate coefficients for the C2H− ion are larger by afactor up to 3 compared to the neutral species.

References

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