Institution: | 1. Department of Physics , University of Waterloo , Waterloo, Ontario, N2L 3G1, Canada;2. Department of Chemistry , University of Guelph , Guelph, Ontario, N1G 2W1, Canada;3. Department of Physics , King Fahd University of Petroleum and Minerals , Dhahran, Saudi Arabia;4. Department of Physics , University of Waterloo , Waterloo, Ontario, N2L 3G1, Canada |