1. Departamento de Física, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil
2. Departamento de Física, Universidade Tecnológica Federal do Paraná, Pato Branco, PR 85503-390, Brazil
3. Faculty of Mechanical Engineering, University of Ljubljana, Ljubljana 1000, Slovenia
4. Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322-0300, USA