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Deposition-mode ice nucleation reexamined at temperatures below 200 K

Journal article
Authors Erik S Thomson
Xiangrui Kong
Panos Papagiannakopoulos
Jan B. C. Pettersson
Published in Atmospheric Chemistry and Physics
Volume 15
Issue 4
Pages 1621-1632
ISSN 1680-7316
Publication year 2015
Published at Department of Chemistry and Molecular Biology
Pages 1621-1632
Language en
Links dx.doi.org/10.5194/acp-15-1621-2015
Keywords HETEROGENEOUS NUCLEATION, MINERAL DUST, HOMOGENEOUS NUCLEATION, SUPERSATURATED VAPOR, KINETIC APPROACH, AB-INITIO, WATER, CONDENSATION, GRAPHITE, SIMULATIONS, Meteorology & Atmospheric Sciences
Subject categories Chemical Sciences

Abstract

The environmental chamber of a molecular beam apparatus is used to study deposition nucleation of ice on graphite, alcohols and acetic and nitric acids at temperatures between 155 and 200 K. The critical supersaturations necessary to spontaneously nucleate water ice on six different substrate materials are observed to occur at higher supersaturations than are theoretically predicted. This contradictory result motivates more careful examination of the experimental conditions and the underlying basis of the current theories. An analysis based on classical nucleation theory supports the view that at these temperatures nucleation is primarily controlled by the rarification of the vapor and the strength of water's interaction with the substrate surface. The technique enables a careful probing of the underlying processes of ice nucleation and the substrate materials of study. The findings are relevant to atmospheric nucleation processes that are intrinsically linked to cold cloud formation and lifetime.

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