1. Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901, United
States
2. Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina
27599-3290, United States
3. Institute of Physics, University of Szczecin, Wielkopolska 15, 70451 Szczecin, Poland
4. Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
5. Max Planck Institut for Polymer Research, D-55128 Mainz, Germany
6. Institute for Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria