ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-6699-2008 Determination of the evaporation coefficient of D<sub>2</sub>O Drisdell W. S. 1 2 Cappa C. D. 3 Smith J. D. 2 Saykally R. J. 1 2 Cohen R. C. 1 4 Department of Chemistry, UC Berkeley, Berkeley, CA, USA Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA Department of Civil and Environmental Engineering, UC Davis, Davis, CA, USA Department of Earth and Planetary Science, UC Berkeley, Berkeley, CA, USA 20 11 2008 8 22 6699 6706 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/8/6699/2008/acp-8-6699-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/6699/2008/acp-8-6699-2008.pdf

The evaporation rate of D<sub>2</sub>O has been determined by Raman thermometry of a droplet train (12–15 μm diameter) injected into vacuum (~10<sup>-5</sup> torr). The cooling rate measured as a function of time in vacuum was fit to a model that accounts for temperature gradients between the surface and the core of the droplets, yielding an evaporation coefficient (&gamma;<sub>e</sub>) of 0.57&plusmn;0.06. This is nearly identical to that found for H<sub>2</sub>O (0.62&plusmn;0.09) using the same experimental method and model, and indicates the existence of a kinetic barrier to evaporation. The application of a recently developed transition-state theory (TST) model suggests that the kinetic barrier is due to librational and hindered translational motions at the liquid surface, and that the lack of an isotope effect is due to competing energetic and entropic factors. The implications of these results for cloud and aerosol particles in the atmosphere are discussed.

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