Interaction of Ions, Atoms and Small Molecules with Quantized Vortex Lines in Superfluid 4He
The lifetimes of both positive and negative ions trapped on quantized vortex lines in rotating 3He-4He mixtures have been measured at temperatures down to 0.1 K. Evidence is found that the 3He condenses at the vortex core, and possibly at the surface of the electron bubble.