1. Mechanical and Aerospace Engineering, University of California, Davis, California 95616, United States
2. Synchrotron-based Atmospheric Research, Nano and Molecular Systems Research Unit, University of Oulu, PO Box 3000, Oulu 90014, Finland
3. Civil and Environmental Engineering, Land, Air and Water Resources and Air Quality Research Center, University of California, Davis, California 95616, United States