1. Department
of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden
2. CNRS, IRAMIS,
LIDYL, Laboratoire Francis Perrin, URA 2453, F-91191 Gif-sur-Yvette, France
3. Division
of Theoretical Chemistry, Lund University, Box 124, 22100 Lund, Sweden
4. Department
of Chemistry Sciences, University of Naples Federico II Via Cintia, 80126 Naples, Italy