1. Contribution from the Department of Chemistry, The University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada, NOVA Research & Technology Corp., 2928 16th Street N.E., Calgary, Alberta T2E 7K7, Canada, and Windsor Molecular Structure Center, Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada