1. Laboratory for Research on the Structure of Matter and Physics Department, University of Pennsylvania, Philadelphia, PA 19104
2. N. Coustel, Laboratory for Research on the Structure of Matter and Materials Science and Engineering Department, University of Pennsylvania, Philadelphia, PA 19104
3. Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104
4. Chemistry Department, Drexel University, Philadelphia, PA 19104
5. Physics Department, Brookhaven National Laboratory, Upton, NY 11973
6. Laboratory for Research on the Structure of Matter and Chemistry Department, University of Pennsylvania, Philadelphia, PA 19104