Physical Review Letters

Evidence for Two Vortex-Ring Species in Dilute He3 - He4 Solutions

Moyses Kuchnir, John B. Ketterson, Pat R. Roach

Published Apr 12, 1971• 5 citations

Abstract

Measurements of the positive-ion velocity as a function of electric field in dilute solutions of $^{3}\mathrm{He}$ in $^{4}\mathrm{He}$ at 18 mK show a discontinuity which suggests the existence of two kinds of vortex rings in addition to the bare ion. The assignment of circulation quantum numbers is discussed.

DOI: 10.1103/physrevlett.26.879

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Physical Review Letters

Evidence for Two Vortex-Ring Species in Dilute He3 - He4 Solutions

Moyses Kuchnir, John B. Ketterson, Pat R. Roach

Published Apr 12, 1971• 5 citations

Publisher

Abstract

Measurements of the positive-ion velocity as a function of electric field in dilute solutions of

^{3}\mathrm{He}

^{4}\mathrm{He}

at 18 mK show a discontinuity which suggests the existence of two kinds of vortex rings in addition to the bare ion. The assignment of circulation quantum numbers is discussed.

DOI: 10.1103/physrevlett.26.879

Related papers

Ion Motion in Dilute He3 - He4 Solutions at Ultralow Temperatures

Moyses Kuchnir, John B. Ketterson, Pat R. Roach

Measurements of the velocity of charge carriers in several dilute solutions of $^{3}\mathrm{He}$ in $^{4}\mathrm{He}$ in the temperature range 0.017-1.0 K are reported. The low-field negative-ion mobility shows a ${T}^{\ensuremath{-}\frac{1}{2}}$ dependence below 0.08 K characteristic of hard-sphere scattering. A maximum is observed in the mobility in the vicinity of 0.4 K. This can be interpreted in terms of a $^{3}\mathrm{He}$ condensation on the bubble surface. The positive-ion mobility is nearly temperature independent below 0.7 K. This has recently been interpreted in terms of a momentum-dependent polarization scattering. The field dependence of the positive-carrier velocity shows a discontinuity in the vortex-ring regime. The discontinuity can be shown to result from a size-dependent drag coefficient and a maximum is observed for very small rings (\ensuremath{\sim}16 \AA{}).Measurements of the velocity of charge carriers in several dilute solutions of $^{3}\mathrm{He}$ in $^{4}\mathrm{He}$ in the temperature range 0.017-1.0 K are reported. The low-field negative-ion mobility shows a ${T}^{\ensuremath{-}\frac{1}{2}}$ dependence below 0.08 K characteristic of hard-sphere scattering. A maximum is observed in the mobility in the vicinity of 0.4 K. This can be interpreted in terms of a $^{3}\mathrm{He}$ condensation on the bubble surface. The positive-ion mobility is nearly temperature independent below 0.7 K. This has recently been interpreted in terms of a momentum-dependent polarization scattering. The field dependence of the positive-carrier velocity shows a discontinuity in the vortex-ring regime. The discontinuity can be shown to result from a size-dependent drag coefficient and a maximum is observed for very small rings (\ensuremath{\sim}16 \AA{}).

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Moyses Kuchnir, John B. Ketterson, Pat R. Roach

Physics Letters ASep 1, 197135 citations

Measurements of the positive-ion velocity as a function of electric field in dilute solutions of

^{3}\mathrm{He}

^{4}\mathrm{He}

at 18 mK show a discontinuity which suggests the existence of two kinds of vortex rings in addition to the bare ion. The assignment of circulation quantum numbers is discussed.

Measurements of the velocity of charge carriers in several dilute solutions of

^{3}\mathrm{He}

^{4}\mathrm{He}

in the temperature range 0.017-1.0 K are reported. The low-field negative-ion mobility shows a ${T}^{\ensuremath{-}\frac{1}{2}}$ dependence below 0.08 K characteristic of hard-sphere scattering. A maximum is observed in the mobility in the vicinity of 0.4 K. This can be interpreted in terms of a

^{3}\mathrm{He}

condensation on the bubble surface. The positive-ion mobility is nearly temperature independent below 0.7 K. This has recently been interpreted in terms of a momentum-dependent polarization scattering. The field dependence of the positive-carrier velocity shows a discontinuity in the vortex-ring regime. The discontinuity can be shown to result from a size-dependent drag coefficient and a maximum is observed for very small rings (\ensuremath{\sim}16 \AA{}).

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.