1. Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, United States
2. Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58108, United States
3. Turtle Mountain Community College, 10145 BIA Road 7, PO Box 340, Belcourt, North Dakota 58316, United States
4. Department of Physics, North Dakota State University, Fargo, North Dakota 58108, United States
5. Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States