1. Graduate Research Assistant, Dept. of Mechanical Science and Engineering, Univ. of Illinois at Urbana-Champaign, 1206 W. Green St., Urbana, IL 61801.
2. Chemist I, Abbott Laboratories, 100 Abbott Park Rd., Abbott Park, IL 60064; formerly, Undergraduate Research Assistant, Dept. of Chemistry, Univ. of Illinois, 600 S. Mathews Ave. 61, Urbana, IL 61801.
3. Undergraduate Student, Hanoi Univ. of Science—VNU, 19 Le Thanh Tong St., Hanoi 10000, Vietnam; formerly, Undergraduate Research Assistant, Dept. of Chemistry, Univ. of Illinois, 600 S. Mathews Ave. 61, Urbana, IL 61801.
4. Deceased; formerly, Professor, Dept. of Mechanical Science and Engineering, Univ. of Illinois at Urbana-Champaign, 1206 W. Green St., Urbana, IL 61801.
5. Professor, Dept. of Chemistry, Univ. of Illinois, 600 S. Mathews Ave. 61, Urbana, IL 61801 (corresponding author).