1. Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
2. Department of Physics, Yeshiva University, New York, New York 10016
3. University of Pittsburgh, Pittsburgh, Pennsylvania 15261
4. University of Illinois, Urbana, Illinois 61801
5. Department of Chemistry, Middle East Technical University, 06531 Ankara, Turkey
6. Shell Oil Company, Houston, Texas 77082