Abstract
The mobilities of positive and negative ions have been measured in liquid helium in the temperature range 0.9-1.0 K as a function of electric field. Within the limits of accuracy of 3%, the mobilities have been fitted to a hydrodynamic theory for the interaction of the ions with rotons in the normal fluid component of He II. A drop in mobility with velocity is predicted. Both the results and those of Schwartz (1970) can be fitted to the theory. The theory contains one adjustable constant. This constant links the variation of ion drift velocity to the velocity field of the superfluid which is responsible for producing an excess roton distribution around the ion, and it relates a macroscopically observed velocity to the microscopic processes of momentum loss by the ion. The results show also no clear evidence for periodic discontinuities in mobility and the theory does not require their existence.
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