1. Condensed Matter Section The Abdus Salam International Center for Theoretical Physics Strada Costiera 11 34151 Trieste Italy
2. Department of Chemistry Yale University P.O. Box 208107 New Haven CT 06520-8107 USA
3. Energy Sciences Institute Yale University P.O. Box 27394 West Haven CT 06516-7394 USA
4. Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA
5. Yale Quantum Institute Yale University P.O. Box 208334 New Haven CT 06520-8263 USA
6. Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max Born Strasse 2A 12489 Berlin Germany