Homogeneous nucleation rates of supercooled water measured in single levitated microdroplets

被引:162
作者
Krämer, B
Hübner, O
Vortisch, H
Wöste, L
Leisner, T
Schwell, M
Rühl, E
Baumgärtel, H
机构
[1] Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany
[2] Free Univ Berlin, Inst Phys & Theoret Chem, D-14195 Berlin, Germany
关键词
D O I
10.1063/1.479946
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Homogeneous nucleation rates are determined for micrometer sized water droplets levitated inside an electrodynamic Paul-trap. The size of a single droplet is continuously measured by analyzing the angle-resolved light scattering pattern of the droplets with classical Mie theory. The freezing process is detected by a pronounced increase in the depolarization of the scattered light. By statistical analysis of the freezing process of some thousand individual droplets, we obtained the homogeneous nucleation rate of water between 236 and 237 K. The values are in agreement with former expansion cloud chamber measurements but could be determined with considerably higher precision. The measurements are discussed in the light of classical nucleation theory in order to obtain the size and the formation energy of the critical nucleus. (C) 1999 American Institute of Physics. [S0021-9606(99)02738-5].
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页码:6521 / 6527
页数:7
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