1. School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K., Molecular Materials Research Center, Beckman Institute, MC 139-74, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, United States, Department of Chemistry, University of Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium, Institute of Physical and Theoretical Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland and Laser Physics...