Rotational excitation of small carbon chains by collisions with He in the ISM A. Spielfiedel, F. Dayou, F. Dumouchel, N. Feautrier, F. Lique and M.-L. Senent EAS Publications Series, 58 (2012) 271-274 Published online: 13 February 2013 DOI: 10.1051/eas/1258043