Atoms in contact (8) : Blowing smoke rings in superfluid helium.

McClintock, Peter V. E. (1977) Atoms in contact (8) : Blowing smoke rings in superfluid helium. New Scientist, 73. pp. 506-508.

Abstract

Strange effects in the behaviour of superfluids are the province of two British physicists who have been dragging charged atoms and electrons (ions) through superfluid helium. In this first of two articles they describe the formation of trapped vortex rings of helium swirling about the moving ion.