1. Department of Chemistry, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
2. Department of Physics, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
3. Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
4. Erzurum Technical University, Department of Fundamental Sciences, Erzurum, Turkey
5. Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115, av. Schweitzer, 33600 Pessac, France