1. Laser Department—Laboratory for Laser Photochemistry, National Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG-36, 077125 Bucharest, Romania
2. Laboratory of Low Dimensional Systems—Group of Gas Sensors, National Institute of Materials Physics, P.O. Box MG-7, 077125 Bucharest-Magurele, Romania
3. Department of Chemistry, Ovidius University of Constanta, 900527 Constanta, Romania