1. Department of Chemistry, Dalhousie University, Halifax, NS B3H 4J3 Canada; and Let’s Talk Science Partnership Program, Dalhousie University, Halifax, NS B3H 4H7 Canada
2. Department of Physics, Dalhousie University, Halifax, NS B3H 3J5 Canada; and Let’s Talk Science Partnership Program, Dalhousie University, Halifax, NS B3H 4H7 Canada