1. Department of Physics and Astronomy, California State University at Northridge, Northridge, California 91330, United States.
2. Center of Organic Chemistry, Romanian Academy, 71141 Bucharest, Romania
3. Department of Chemistry & Biochemistry, The University of Alabama, Box 870336, Tuscaloosa, Alabama 35487, United States
4. Zavoisky-Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan 420029, Russian Federation
5. Electrical and Computer Engineering Department, University of California, Los Angeles, Los Angeles, CA90095, United States