1. Laboratory for Computational Molecular Design; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
2. National Centre for Computational Design and Discovery of Novel Materials (MARVEL); Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
3. Current Address: Department of Physics; Chalmers University of Technology; Fysikgränd 3 SE-412 96 Göteborg Sweden