1. Department of Chemistry and Biochemistry, Georgia Southern University, Statesboro, Georgia 30460-8064, USA
2. Department of Information Technology, Georgia Southern University, Statesboro, Georgia 30460-8150, USA
3. Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
4. MS 245-1, NASA Ames Research Center, Moffett Field, California 94035-1000, USA