Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA

Department of Chemistry, University of Otago, Dunedin, New Zealand

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA

Center for Aerosol and Cloud Chemistry, Aerodyne Inc., Billerica, MA, USA

Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA

Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA

Division of Geophysical and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA