[1] UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND
[2] UNIV LIVERPOOL,DEPT CHEM,LIVERPOOL L69 3BX,ENGLAND
[3] UNIV KEELE,DEPT PHYS,KEELE ST5 5BG,STAFFS,ENGLAND
[4] SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND
[5] UNIV MANCHESTER,INST SCI & TECHNOL,DEPT CHEM,MANCHESTER M60 1QD,LANCS,ENGLAND