Lengyel, J; Kočišek, J; Poterya, V; Pysanenko, A; Svrčková, P; Fárník, M; Zaouris, DK; Lengyel, J; Kočišek, J; Poterya, V; Pysanenko, A; Svrčková, P; Fárník, M; Zaouris, DK; Fedor, J; - view fewer (2012) Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections. The Journal of Chemical Physics , 137 (3) , Article 034304. 10.1063/1.4733987.

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Abstract

Uptake of several atmospheric molecules on free icenanoparticles was investigated. Typical examples were chosen: water, methane, NO x species (NO, NO2), hydrogen halides (HCl, HBr), and volatile organic compounds (CH3OH, CH3CH2OH). The cross sections for pickup of these molecules on icenanoparticles (H2O) N with the mean size of N¯≈260N¯≈260 (diameter ∼2.3 nm) were measured in a molecular beam experiment. These cross sections were determined from the clusterbeamvelocity decrease due to the momentum transfer during the pickup process. For water molecules molecular dynamics simulations were performed to learn the details of the pickup process. The experimental results for water are in good agreement with the simulations. The pickup cross sections of ice particles of several nanometers in diameter can be more than 3 times larger than the geometrical cross sections of these particles. This can have significant consequences in modelling of atmospheric icenanoparticles, e.g., their growth.

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