1. Department of Chemistry, University of Fribourg, Chemin du
Musée 9, 1700 Fribourg, Switzerland
2. Institute of Physical Chemistry, Splaiul Independentei
202, Bucharest 060021, Romania
3. Laboratoire de physique de la matière
et modélisation mathématique LPQ3M, Université de Mascara, Mascara, Algerie
4. Faculty of Science and
Technology, University of Siegen, Adolf-Reichwein Strasse 2, 57068 Siegen, Germany