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Preprints
https://doi.org/10.5194/acp-2020-943
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-943
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 Oct 2020

28 Oct 2020

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This preprint is currently under review for the journal ACP.

Technical note: the enhancement limit of coagulation scavenging of small charged particles

Naser G. A. Mahfouz1,2 and Neil M. Donahue1,2,3,4 Naser G. A. Mahfouz and Neil M. Donahue
  • 1Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
  • 2Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
  • 3Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, USA
  • 4Department of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, PA, USA

Abstract. We show that the limit of the enhancement of coagulation scavenging of charged particles is 2 (doubled compared to the neutral case). Because the particle survival probability decreases exponentially as the coagulation sink increases, all else being equal, the doubling of the coagulation sink can amount to a dramatic drop in survival probability–squaring the survival probability, p2, where p ≤ 1 is the survival probability in the neutral case. Thus, it is imperative to consider this counterbalancing effect when studying ion-induced new-particle formation and ion-enhanced new-particle growth in the atmosphere.

Naser G. A. Mahfouz and Neil M. Donahue

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Naser G. A. Mahfouz and Neil M. Donahue

Naser G. A. Mahfouz and Neil M. Donahue

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Short summary
In this technical note, we show that the limit of the coagulation scavenging enhancement of charged particles is asymptotically 2; that is, in the limit, charged particles are lost at twice the rate of their neutral counterparts. This has serious implications for aerosol particle survivability where ions play a role in nucleation and growth. Such cases can happen readily in experiments, and cannot be neglected in the atmosphere.
In this technical note, we show that the limit of the coagulation scavenging enhancement of...
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