1. Department of Chemistry, U-60, University of Connecticut, Storrs, CT 06269
2. Departments of Chemistry and Chemical Engineering and Institute of Materials Science, U-60, University of Connecticut, Storrs, CT 06269
3. Department of Metallurgy and Institute of Materials Science, University of Connecticut, Storrs, CT 06269
4. Texaco Research Center, Texaco, Inc., P.O. Box 509, Beacon, NY 12508