1. Mercedes-Benz Research and Development North America, Sunnyvale, California 94085, USA
2. Department of Chemistry, University of California Berkeley, Berkeley, California 94720, USA
3. The Molecular Sciences Software Institute, Blacksburg, Virginia 24060, USA
4. Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
5. Fritz Haber Center for Molecular Dynamics, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
6. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA
7. Materials Sciences Devision, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
8. The Raymond and Beverly Sackler Center of Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel