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Condensation of isotopic impurities on the negative ion in He II.

Allum, D. R. and McClintock, Peter V. E. (1976) Condensation of isotopic impurities on the negative ion in He II. Journal of Physics C: Solid State Physics, 9 (11). L273-L276. ISSN 0022-3719

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Abstract

We report experimental evidence that the rate nu at which a negative ion nucleates vortex rings in He II is strongly influenced by 3He isotopic impurity concentrations close to that of the natural abundance. We suggest that the anomalous temperature dependence of nu observed near 0.3K in earlier experiments in natural 4He is a consequence of 3He condensation on the ions, and we deduce from our data that the presence of as few as five condensed atoms is sufficient to completely eliminate the bare ion signal in a typical experimental geometry.

Item Type: Article
Journal or Publication Title: Journal of Physics C: Solid State Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 32516
Deposited By: Professor P. V. E. McClintock
Deposited On: 12 Apr 2010 12:10
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 17:11
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/32516

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