1. Department of Physics, Florida A&M University, Tallahassee, Florida 32307, United States
2. Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
3. Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Semenov prospect 1, Chernogolovka, 142432, Russia
4. Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272, United States