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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  29 Apr 2020

29 Apr 2020

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This preprint is currently under review for the journal ACP.

Pre-deliquescent water uptake in deposited nanoparticles observed with in situ ambient pressure X-ray photoelectron spectroscopy

Jack J. Lin1, Kamal Raj R1, Stella Wang2, Esko Kokkonen3, Mikko-Heikki Mikkelä3, Samuli Urpelainen1, and Nønne L. Prisle1 Jack J. Lin et al.
  • 1Nano and Molecular Systems Research Unit, P.O. Box 3000, FI-90014 University of Oulu, Finland
  • 2Division of Physics, Math, and Astronomy, California Institute of Technology, Pasadena, California, 91125, USA
  • 3MAX IV Laboratory, Lund University, Box 118, SE-22100 Lund, Sweden

Abstract. We study the adsorption of water onto deposited inorganic sodium chloride and organic malonic acid and sucrose nanoparticles at ambient water pressures corresponding to relative humidities (RH) from 0 to 16 %. To obtain information about water uptake at conditions where not accessible with typical aerosol instrumentation, we use surface-sensitive ambient pressure X-ray photoelectron spectroscopy (APXPS), which has a detection sensitivity from parts per thousand. Our results show that water is already adsorbed on sodium chloride particles at RH well below deliquescence, and that the chemical environment on the particle surface is changing with increasing humidity. While the sucrose particles exhibit only very modest changes on the surface at these relative humidities, the chemical composition and environment of malonic acid particle surfaces is clearly affected. Our observations indicate that water uptake by inorganic and organic aerosol particles could already have an impact on atmospheric chemistry at low relative humidities. We also conclude that the APXPS technique is a viable tool for studying chemical changes on the surfaces of atmospherically relevant aerosol particles which are not accessible with typical online mass- and volume-based methods.

Jack J. Lin et al.

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Jack J. Lin et al.

Jack J. Lin et al.


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