Abundances of PAHs in the ISM: confronting observations with experimental results R. Gredel, Y. Carpentier, G. Rouillé, M. Steglich, F. Huisken and Th. Henning A&A, 530 (2011) A26 Published online: 02 May 2011 DOI: 10.1051/0004-6361/201116602