Abstract
The mobility of positive and negative charges in liquid helium II has been measured as a function of the pressure, for pressures ranging from the vapour pressure to the melting point, in the temperature range 1.9 to 1.1 °K. The mobility of the positive charges was found to decrease with the increasing pressure, but this decrease cannot be accounted for in-terms of the known change in the roton density. The negative charges behave in a peculiar way which can be easily accounted for by the bubble model. For both charges an unexplained sharp break is found at about 1.3 °K especially at the higher pressures.
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