1. Department of Chemistry, University of Bergen, NO-5007 Bergen, Norway, Physics Department, Western Michigan University, Kalamazoo, Michigan 49008, Department of Physical Sciences, University of Oulu, FIN-90014 Oulu, Finland, Advanced Light Source, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, Keuka College, Keuka Park, New York 14478, and Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003