EAS Publications Series
Volume 58, 2012ECLA - European Conference on Laboratory Astrophysics
|Page(s)||271 - 274|
|Published online||13 February 2013|
C. Stehlé, C. Joblin and L. d’Hendecourt (eds)
EAS Publications Series, 58 (2012) 271-274
Rotational excitation of small carbon chains by collisions with He in the ISM
1 LERMA – UMR 8112, Observatoire de
Paris, 5 place Jules
2 LOMC – UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 540, 76058 Le Havre, France
3 Departmento de Fisica y Quimica Teóricas, Instituto de Estructura de la Materia, CSIC, Calle Serrano 121, 28006 Madrid, Spain
Modeling of molecular emission from interstellar clouds requires the calculation of rate coefficients for excitation by collision with the most abundant species. Based on new highly correlated potential energy surfaces, rotational excitation of C2H and C2H− radicals in collision with He are investigated. C2H fine and hyperfine structure is taken into account. As already found for other systems, rate coefficients for the C2H− ion are larger by a factor up to 3 compared to the neutral species.
© The Author(s) 2013
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