[1] UNIV ILLINOIS,SCH CHEM SCI,URBANA,IL 61801
[2] WEIZMANN INST SCI,DEPT CHEM PHYS,REHOVOTH,ISRAEL
[3] UNIV DELHI,DEPT PHYS & ASTROPHYS,DELHI 7,INDIA
[4] BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912
[5] MAX PLANCK INST STROMUNGS FORSCH,ABT MOLEK WECHSELWIRKUNGEN,BOTTINGER STR 6-8,3400 GOTTINGEN,WEST GERMANY