1. Department of Chemistry, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil, Department of Physics, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil, Department of Physics, Universidade Federal do Paraná, Curitiba, PR 81531-990, Brazil, Department of Physics, Comission Nacional de Energia Atomica, Avenida Libertador 8250, 1429 Buenos Aires, Argentina, and Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107