1. Laboratory for Theoretical Chemistry, Institute of Chemistry, Eötvös Loránd University, P. O. Box 32, H-1518 Budapest, Hungary
2. Jülich Supercomputer Centre, Institute of Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
3. Department of Chemistry and Biochemistry, Gonzaga University, 502 East Boone Avenue, Spokane, Washington 99258-0102, United States
4. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
5. Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, A-1090 Vienna, Austria
6. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States