1. Laboratoire de Magnétisme et d'Optique, CNRS-Université de Versailles Saint Quentin, 45, Avenue des Etats-Unis, 78035 Versailles Cedex, France, Department of Chemistry, University of Pune, Pune 411 007, India, Alexandru Ioan Cuza University, Faculty of Physics, Iasi 6600, Romania, Institute of Chemistry, University P. J. Šafárik, Moyzesova 11, 041 54 Košice, Slovakia, and Department of Applied Chemistry, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113, Japan