[1] UNIV CHICAGO, JAMES FRANCK INST, CHICAGO, IL 60637 USA
[2] UNIV CHICAGO, DEPT CHEM, CHICAGO, IL 60637 USA
[3] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV MAT & MOLEC RES, BERKELEY, CA 94720 USA
[4] UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA