1. City College of the City University of New York, Institute for Ultrafast Spectroscopy and Lasers, and Department of Physics, 160 Convent Avenue, New York 10031
2. City College of the City University of New York, Institute for Ultrafast Spectroscopy and Lasers, and Department of Physics, 160 Convent Avenue, New York 10031bUniversidade de São Paulo, Instituto de Física de São Carlos, São Carlos 05508-060, Brasil