09 Dec 2022
09 Dec 2022
Status: this preprint is currently under review for the journal ACP.

Measurement of the rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber

Joschka Pfeifer1,7, Naser G. Mahfouz2,3,4, Ben Schulze5, Serge Mathot1, Dominik Stolzenburg6, Rima Baalbaki6, Zoé Brasseur6, Lucia Caudillo7, Lubna Dada8, Manuel Granzin7, Xu-Cheng He6,9, Houssni Lamkaddam8, Brandon Lopez3, Vladimir Makhmutov10,11, Ruby Marten8, Bernhard Mentler12, Tatjana Müller7, Antti Onnela1, Maxim Philippov10, Ana A. Piedehierro9, Birte Rörup6, Meredith Schervish2,13, Ping Tian14, Nsikanabasi S. Umo15, Dongyu S. Wang8, Mingyi Wang5, Stefan K. Weber1,7, André Welti9, Yusheng Wu6, Marcel Zauner-Wieczorek7, Antonio Amorim16, Imad El Haddad8, Markku Kulmala6, Katrianne Lehtipalo6,9, Tuukka Petäjä6, António Tomé17, Sander Mirme18,19, Hanna E. Manninen1, Neil M. Donahue2,3, Richard C. Flagan5, Andreas Kürten7, Joachim Curtius7, and Jasper Kirkby1,7 Joschka Pfeifer et al.
  • 1CERN, 1211 Geneva, Switzerland
  • 2Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA 15213, USA
  • 3Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
  • 4Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ 08544, USA
  • 5Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA 91125, USA
  • 6Institute for Atmospheric and Earth System Research (INAR)/ Physics, Faculty of Science, University of Helsinki, Helsinki, FI-00560, Finland
  • 7Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
  • 8Laboratory of Atmospheric Chemistry, Paul Scherrer Institute (PSI), 5232 Villigen-PSI, Switzerland
  • 9Finnish Meteorological Institute, 00560 Helsinki, Finland
  • 10P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russian Federation
  • 11Moscow Institute of Physics and Technology (National Research University), 117303 Moscow, Russian Federation
  • 12Institute for Ion and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria
  • 13Department of Chemistry, University of California, Irvine, CA 92697, USA
  • 14Beijing weather modification center, Beijing, 100089, China
  • 15Institute of Meteorology and Climate Research (IMK-AAF), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
  • 16CENTRA and FCUL, University of Lisbon, 1749-016 Lisbon, Portugal
  • 17IDL-Universidade da Beira Interior, Rua Marquês D'Ávila e Bolama, 6201-001 Covilhã, Portugal
  • 18Institute of Physics, Unversity of Tartu, Estonia
  • 19Airel Ltd., 50411, Tartu, Estonia

Abstract. Aerosol particles have an important role in Earth’s radiation balance and climate, both directly and indirectly through aerosol–cloud interactions. Most aerosol particles in the atmosphere are weakly charged, affecting both their collision rates with ions and neutral molecules, as well as the rates by which they are scavenged by other aerosol particles and cloud droplets. The rate coefficients between ions and aerosol particles are important since they determine the growth rates and lifetimes of ions and charged aerosol particles, and so may influence cloud dynamics and aerosol processing. However, despite their importance, very few experimental measurements exist of charged aerosol collision rates under atmospheric conditions, where galactic cosmic rays in the lower troposphere give rise to ion pair concentrations of around 1000 cm−3. Here we present measurements in the CERN CLOUD chamber of the rate coefficients between ions and small (<10 nm) aerosol particles containing up to 9 elementary charges, e. We find the rate coefficient of a singly charged ion with an oppositely charged particle increases from 2.0 (0.4–4.4) × 10−6 cm3 s−1 to 30.6 (24.9–45.1) × 10−6 cm3 s−1 for particles with charges of 1e to 9e, respectively, where the parentheses indicate the ±1σ uncertainty interval. Our measurements are compatible with theoretical predictions and show excellent agreement with the model of Gatti and Kortshagen (2008).

Joschka Pfeifer et al.

Status: open (until 15 Feb 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-805', Anonymous Referee #1, 15 Jan 2023 reply

Joschka Pfeifer et al.

Joschka Pfeifer et al.


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Short summary
Attachment rate coefficients between ions and charged aerosol particles determine their lifetimes, and may also influence cloud dynamics and aerosol processing. Here we present novel experiments that measure ion-aerosol attachment rate coefficients for multiply-charged aerosol particles under atmospheric conditions in the CERN CLOUD chamber. Our results provide experimental discrimination between various theoretical models.