1. Department of Chemistry − Ångström Laboratory, Uppsala University, Box 538, SE-751 21 Uppsala, Sweden
2. Instituto de Química−Departamento de Físico-química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, CEP 24020-150 Niterói, RJ, Brazil
3. Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden