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| Titel |
Deposition-mode ice nucleation reexamined at temperatures below 200 K |
| VerfasserIn |
E. S. Thomson, X. Kong, P. Papagiannakopoulos, J. B. C. Pettersson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-16), S.1621-1632 |
| Datensatznummer |
250119434
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| Publikation (Nr.) |
 copernicus.org/acp-15-1621-2015.pdf |
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| Zusammenfassung |
| 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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