1. Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Key Laboratory of Excited-state Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P.R. China, and Department of Physics, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal