1. Institute of Solid State Physics, University of Latvia, 8 Kengaraga Street, LV1063 Riga, Latvia
2. Dipartimento di Chimica, Università di Torino and NIS (Nanostructured Interfaces and Surfaces) Centre, Via P. Giuria 5, 10125 Torino, Italy
3. Department of Chemical Sciences, Università degli studi di Napoli Federico II, Complesso Universitario di Monte Sant’Angelo, Via Cintia, 21, 80126 Napoli, Italy
4. Université de Lorraine, Nancy, CNRS, Laboratoire de Physique et Chimie Théoriques, UMR, 7019 Vandoeuvre-les-Nancy, France