1. Department
of Physics, J-419, City College of New York, 138th Street, Convent Avenue, New York, New York 10031, United States
2. Department
of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
3. Department
of Biological Sciences, Brock University, 500 Glenridge Ave., St. Catherines, ON LS2 3A1, Canada