1. Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, Georgia 30322
2. Department of Chemistry, University of Reading, RG6 2AD England
3. SETI Institute, 515 North Whisman Road, Mountain View, California 94043
4. Department of Chemistry, University of Southern California, Los Angeles, California 90089
5. Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439