1. Molecular
and Condensed Matter Physics, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
2. Department
of Chemistry-Ångström Laboratory, Uppsala University, Box 523, 75121 Uppsala, Sweden
3. Laboratory
for Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015-Lausanne, Switzerland
4. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
5. Materials
Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
6. Department
of Physics, AlbaNova University Center, Stockholm University, 106
91 Stockholm, Sweden