Journal of Low Temperature Physics

, Volume 1, Issue 4, pp 289–311 | Cite as

Trapped-ion motion in helium II

  • William I. Glaberson
Article
Received:

Abstract

We present the results of a series of experiments on the mobility of negative ions trapped on quantized vortex lines in superfluid helium. Trapped-ion mobilities were measured as a function of temperature, pressure, and He3 concentration. Some of the experimental data have been previously reported.1,2 The temperature and pressure dependence of trapped-ion mobilities is qualitatively different than that of free ions. The He3 data strongly suggest that the negative ion bubble does not become deformed on the vortex line. We present a model for a vortex line having a central “core” of normal fluid extending over a distance of several angstroms surrounded by a “tail,” a region of excess roton density whose momenta are predominantly aligned opposite to the direction of circulation of the superfluid. This model is used to calculate the drag on a negative ion trapped on a vortex line. The model appears to account for the experimental results satisfactorily.

Keywords

Experimental Data Vortex Helium Magnetic Material Pressure Dependence 
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Copyright information

© Plenum Publishing Corporation 1969

Authors and Affiliations

  • William I. Glaberson
    • 1
  1. 1.Department of PhysicsUniversity of OregonEugene

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