Resonance Raman spectroscopy and quantum-chemical calculations of push-pull molecules: 4-hydroxy-4'-nitroazobenzene and its anion - Ando, Rômulo Augusto; Rodríguez-Redondo, José Lorenzo; Sastre-Santos, A.; Fernández-Lázaro, Fernando; Azzellini, Gianluca Camillo; Borin, Antonio Carlos; Santos, Paulo Sérgio (Journal of Physical Chemistry A, 2007)