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Collision dynamics and uptake of water on alcohol-covered ice

Artikel i vetenskaplig tidskrift
Författare Erik S Thomson
Xiangrui Kong
Nikola Markovic
Panos Papagiannakopoulos
Jan B. C. Pettersson
Publicerad i Atmospheric Chemistry and Physics
Volym 13
Nummer/häfte 4
Sidor 2223-2233
ISSN 1680-7316
Publiceringsår 2013
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 2223-2233
Språk en
Länkar dx.doi.org/10.5194/acp-13-2223-2013
https://gup.ub.gu.se/file/98036
Ämnesord supercooled sulfuric-acid, mass accommodation, argon collisions, butanol, films, n-alcohols, evaporation, methanol, condensation, monolayers, simulations
Ämneskategorier Kemi

Sammanfattning

Molecular scattering experiments are used to investigate water interactions with methanol and n-butanol covered ice between 155 K and 200 K. The inelastically scattered and desorbed products of an incident molecular beam are measured and analyzed to illuminate molecular scale processes. The residence time and uptake coefficients of water impinging on alcohol-covered ice are calculated. The surfactant molecules are observed to affect water transport to and from the ice surface in a manner that is related to the number of carbon atoms they contain. Butanol films on ice are observed to reduce water uptake by 20 %, whereas methanol monolayers pose no significant barrier to water transport. Water colliding with methanol covered ice rapidly permeates the alcohol layer, but on butanol water molecules have mean surface lifetimes of less than or similar to 0.6 ms, enabling some molecules to thermally desorb before reaching the water ice underlying the butanol. These observations are put into the context of cloud and atmospheric scale processes, where such surfactant layers may affect a range of aerosol processes, and thus have implications for cloud evolution, the global water cycle, and long term climate.

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