1. Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States
2. Aerodyne Research, Inc., Billerica, Massachusetts, United States
3. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
4. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
5. Department of Meteorology and Atmospheric Sciences, The Pennsylvania State University, State College, Pennsylvania, United States