[1] SWISS FED INST TECHNOL,PHYS CHEM LAB,CH-8092 ZURICH,SWITZERLAND
[2] NATL UNIV LA PLATA,DEPT FIS,RA-1900 LA PLATA,ARGENTINA
[3] UNIV CALGARY,DEPT CHEM,CALGARY T2N 1N4,ALBERTA,CANADA
[4] CNR,IST SPETTROSCOPIA MOLEC,I-40136 BOLOGNA,ITALY
[5] DEF RES ESTAB VALCARTIER,COURCELLETTE G0A 1R0,QUEBEC,CANADA