1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
2. University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
3. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen PSI CH-5232, Switzerland