Anomalous behaviour of negative ions in He II.

Ellis, T. and McClintock, Peter V. E. (1984) Anomalous behaviour of negative ions in He II. In: Proceedings of the 17th International Conference on Low Temperature Physics :. North-Holland Physics Publishing, Amsterdam, pp. 287-288. ISBN 0 444 86910 7

Abstract

When negative ions move through Hell under roton-emission-limited conditions in very weak electric fields: (a) their drift velocity falls below that predicted by the E1/3 law followed accurately for E > 400 V/m; (b) their effective mass apparently rises with decreasing E. The physical origins of these unexpected phenomena are not understood.