Transient negative ion spectrum of the cytosine-guanine pair Fernanda Brandalise Nunes, Márcio Teixeira do Nascimento Varella, Diego Farago Pastega, Thiago Correa Freitas, Marco Aurélio Pinheiro Lima, Márcio Henrique Franco Bettega and Sergio d’Almeida Sanchez Eur. Phys. J. D, 71 4 (2017) 92 Published online: 13 April 2017 DOI: 10.1140/epjd/e2017-70786-5