Affiliation: | (1) Department of Physics, Federal University of Rio Grande do Sul (UFRGS), 91501-970 Porto Alegre, RS, Brazil;(2) Department of Inorganic Chemistry, Federal University of Rio Grande do Sul (UFRGS), 91501-970 Porto Alegre, RS, Brazil;(3) Department of Chemistry, Federal University of Goiás (UFG), 74001-970 Goiânia, GO, Brazil |