1. Institute for Theoretical Chemistry, University of Vienna, Vienna, Austria
2. Institute of Advanced Simulation, Jülich Supercomputer Centre, Jülich, Germany
3. Laboratory for Theoretical Chemistry, Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary
4. Department of Chemistry, University of Illinois, Urbana, IL, USA
5. Department of Chemistry, The Ohio State University, Columbus, OH, USA
6. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL, USA