1. Helmholtz-Zentrum Geesthacht
2. Institute of Materials Research
3. D-21502 Geesthacht
4. Germany
5. Pavia H2 Lab
6. C.S.G.I. & Dipartimento di Chimica
7. Sezione di Chimica Fisica
8. Universitá di Pavia
9. I-27100 Pavia
10. Department of Chemistry and NIS Centre
11. University of Torino
12. I–10125 Torino
13. Italy
14. Helmut Schmidt University