Peter Aaron Alpert¹, Pablo Corral Arroyo^1,2, Jing Dou³, Ulrich Karl Krieger³, Sarah S. Steimer⁴, Jan-David Förster⁵, Florian Ditas⁵, Christopher Pöhlker⁵, Stéphanie Rossignol^6,7, Monica Passananti^8,9, Sebastien Perrier⁶, Christian George⁶, Manabu Shiraiwa¹⁰, Thomas Berkemeier^5,11, Benjamin Watts¹² and Markus Ammann¹, (1)Paul Scherrer Institute, Laboratory of Environmental Chemistry, Villingen, Switzerland, (2)ETH Swiss Federal Institute of Technology Zurich, Institute for Physical Chemistry, Zurich, Switzerland, (3)ETH Swiss Federal Institute of Technology Zurich, Institute for Atmosphere and Climate Science, Zurich, Switzerland, (4)University of Cambridge, Department of Chemistry, Cambridge, United Kingdom, (5)Max Planck Institute for Chemistry, Multiphase Chemistry Department, Mainz, Germany, (6)University Claude Bernard Lyon 1, CNRS, Villeurbanne, France, (7)Aix Marseille University, CNRS, Marseille Cedex 03, France, (8)University of Torino, Department of Chemistry, Torino, Italy, (9)University of Helsinki, Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, Helsinki, Finland, (10)University of California Irvine, Department of Chemistry, Irvine, CA, United States, (11)Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, Atlanta, GA, United States, (12)Paul Scherrer Institute, Laboratory for Synchrotron Radiation-Condensed Matter, Villigen, Switzerland