[1] Univ Gothenburg, Dept Phys, Origovagen 6B, S-41258 Gothenburg, Sweden
[2] Univ Perugia, Dept Civil & Environm Engn, Via G Duranti 93, I-06125 Perugia, Italy
[3] CNR Ist Officina Mat IOM, Lab TASC, I-34149 Trieste, Italy
[4] Univ Sapienza, Dipartimento Chim & Tecnol Farm, I-00185 Rome, Italy
[5] Univ Southampton, Sch Chem, Southampton SO17 1BJ, Hants, England
[6] Univ Gothenburg, Dept Chem & Mol Biol, Box 462, S-40530 Gothenburg, Sweden
[7] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, South Parks Rd, Oxford OX1 3QZ, England
[8] Univ Gustave Eiffel, COSYS, IMSE, 5 Bd Descartes, F-77454 Champs Sur Marne, France