1. Chemistry Department, Brandon University, 270 18th Street, Brandon, MB, R7A
6A9 Canada
2. Physics Department, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1 Canada
3. Institute for Molecules
and Materials, Radboud University, Heyendaalseweg 135, NL-6525 AJ Nijmegen, The Netherlands, and Laser Centre, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
4. Chemistry Department, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1 Canada