Institution: | a National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor, P.O. Box MG-36, RO-077125, Bucharest-Magurele, Romania b Institute of Physics, Academy of Sciences of Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic c National Institute for Chemical-Pharmaceutical R&D, 112 Vitan, 74373 Bucharest 3, Romania d Petru Poni Institute of Macromolecular Chemistry, Iasi 6600, Romania e University of Agriculture Sciences and Veterinary Medicine, 59 Marasti, Bucharest, Romania f University of Bucharest, Faculty of Physics, P.O. Box MG-38, 3 Nano-SAE Research Center, Bucharest-Magurele, Romania g US Naval Research Laboratory, Washington, DC 20375-5345, USA |