[1] LEOPOLD FRANZENS UNIV, INST EXPTL PHYS, KERNPHYS & GASELEKTRONIK ABT, A-6020 INNSBRUCK, AUSTRIA
[2] PMF, KRAGUJEVAC, YUGOSLAVIA
[3] INST PHYS, YU-11001 BELGRADE, YUGOSLAVIA
[4] PENN STATE UNIV, DEPT CHEM, UNIVERSITY PK, PA 16802 USA
[5] HOHERE TECH BUNDESLEHR & VERSUCHSANSTALT, A-6020 INNSBRUCK, AUSTRIA