1. Department of Chemistry and Biochemistry; Center for Polymers and Organic Solids; University of California at Santa Barbara; Santa Barbara CA 93106 USA
2. Theoretical Division, Los Alamos National Laboratory; Los Alamos NM 87545 USA
3. Department of Chemistry and Biochemistry; Department of Molecular; Cellular, and Developmental Biology; University of California at Santa Barbara; Santa Barbara CA 93106 USA
4. Department of Chemistry and Biochemistry; Department of Materials; Center for Polymers and Organic Solids; University of California at Santa Barbara; Santa Barbara CA 93106 USA