1. Department of Chemistry and Physics; Mount Saint Vincent University; Halifax Nova Scotia B3M 2J6 Canada
2. Department of Chemistry; Dalhousie University; Halifax Nova Scotia B3H 4J3 Canada
3. Department of Chemistry; Saint Mary's University; Halifax Nova Scotia B3H 3C3 Canada
4. Department of Physics, Faculty of Science, Space Astronomy Laboratory; The University of Hong Kong; Pokfulam Road Hong Kong SAR China
5. 19460 Wilderness Dr.; West Linn Oregon
6. Philipps-Universität Marburg Hans-Meerweinstr.; Marburg 4 D-35032 Germany
7. Donostia International Physics Center (DIPC); P.K. 1072, 20080 Donostia Euskadi Spain