1. Adam Mickiewicz University, Faculty of Chemistry, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland
2. Universidad de La Laguna, MALTA-Consolider Team, IMN and IUdEA, Departamento de Fisica, Apdo. Correos 456, E-38200, San Cristobal de La Laguna, Santa Cruz de Tenerife, Spain