Vortex nucleation by negative ion in superfluid He4

We describe an experiment which indicates that the addition of ${\mathrm{He}}^{3}$ impurities to superfluid helium has a pronounced effect on the velocity at which negative ions produce vorticity (vortex rings). The ${\mathrm{He}}^{3}$ impurities have no effect, however, on the creation of vorticity by positive ions.We describe an experiment which indicates that the addition of ${\mathrm{He}}^{3}$ impurities to superfluid helium has a pronounced effect on the velocity at which negative ions produce vorticity (vortex rings). The ${\mathrm{He}}^{3}$ impurities have no effect, however, on the creation of vorticity by positive ions.

Physical Review LettersJun 24, 196851 citations

We describe an experiment which indicates that the addition of

{\mathrm{He}}^{3}

impurities to superfluid helium has a pronounced effect on the velocity at which negative ions produce vorticity (vortex rings). The

{\mathrm{He}}^{3}

impurities have no effect, however, on the creation of vorticity by positive ions.