1. Chemistry DepartmentFederal University of Viçosa, Viçosa Zip Code 36570–000, Minas Gerais State Brazil
2. Physics DepartmentFederal University of Viçosa, Viçosa Zip Code 36570–000, Minas Gerais State Brazil
3. Department of Physics and ChemistryFederal University of Espírito Santo, Alegre, Espírito Santo Brazil, 29.500-000