Traces of Vortices in Superfluid Helium Droplets

被引:110
|
作者
Gomez, Luis F. [1 ]
Loginov, Evgeny [1 ]
Vilesov, Andrey F. [1 ]
机构
[1] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA
基金
美国国家科学基金会;
关键词
LIQUID-HELIUM; SPECTROSCOPY; MOLECULES; CLUSTERS; NANODROPLETS; DROPS;
D O I
10.1103/PhysRevLett.108.155302
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on the observation of vortices in superfluid He-4 droplets produced in the expansion of liquid He. The vortices were traced by introducing Ag atoms, which clustered along the vortex lines, into the droplets. The Ag clusters were subsequently surface-deposited and imaged via electron microscopy. The prevalence of elongated track-shaped deposits shows that vortices are present in droplets larger than about 300 nm and that their lifetime exceeds a few milliseconds. We discuss the possible formation mechanisms and the stability of the vortices.
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页数:5
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