1 Dipartimento di Chimica "Giacomo Ciamician", Università di Bologna, Via F. Selmi 2, Bologna 40126, Italy.
2 International Centre for Quantum and Molecular Structures, Physics Department, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
3 Department of Chemistry, Pritzker School of Molecular Engineering, The James Franck Institute and Chicago Center for Theoretical Chemistry, The University of Chicago, Chicago 60637, Illinois, United States.
4 Argonne National Laboratory, 9700 S. Cass Avenue, Lemont 60439, Illinois, United States.