1. Chair for Theoretical Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching, Germany
2. Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
3. SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory and Stanford University (USA), 443 Via Ortega, Stanford, California 94035-4300, USA