1. Professor of Chemistry, Univ. of Rhode Island, Kingston, RI 02881.
2. Professor and Director of RI Transportation Research Center, Dept. of Civil and Environment Engineering, Univ. of Rhode Island, Kingston, RI 02881 (corresponding author).
3. Graduate Student, Dept. of Chemistry, Univ. of Rhode Island, Kingston, RI 02881.
4. Research Assistant, Dept. of Chemistry, Univ. of Rhode Island, Kingston, RI 02881.