1. Center
for Combustion Energy and Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
2. Gaussian, Inc., 340 Quinnipiac
Street, Building 40, Wallingford, Connecticut 06492, United States
3. Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS), c/Jenaro de la Fuente s/n, Campus
Vida, Universidade de Santiago de Compostela, 15782 Santiago
de Compostela, Spain
4. Department
of Chemistry, Chemical Theory Center, and Minnesota Supercomputing
Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States