Astronomical identification of CN-, the smallest observed molecular anion M. Agúndez, J. Cernicharo, M. Guélin, C. Kahane, E. Roueff, J. Kłos, F. J. Aoiz, F. Lique, N. Marcelino, J. R. Goicoechea et al. (4 more) A&A, 517 (2010) L2 Published online: 30 July 2010 DOI: 10.1051/0004-6361/201015186