1. Laboratory
of Theoretical Chemistry, Unit of Theoretical and Structural Physical
Chemistry, Namur Institute of Structured Matter, University of Namur, Rue de Bruxelles 61, 5000 Namur, Belgium
2. Laboratory
of Molecular Imaging and Photonics, University of Leuven, Celestijnlaan,
200F, Box 2404, 3001 Leuven, Belgium