A.F. Borghesani
- Published in print:
- 2007
- Published Online:
- January 2008
- ISBN:
- 9780199213603
- eISBN:
- 9780191707421
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213603.003.0023
- Subject:
- Physics, Condensed Matter Physics / Materials
The realization that ions of different size are produced in liquid 3He with different concentrations of 4He isotopic impurities has allowed researchers to select the ion to be studied just by ...
More
The realization that ions of different size are produced in liquid 3He with different concentrations of 4He isotopic impurities has allowed researchers to select the ion to be studied just by changing the purity of the liquid. At about 70 mK, the positive ion mobility has a discontinuity related to the impossibility of further increase of an 4He-rich halo around the ion. Below the discontinuity, the temperature dependence of the mobility in the zero-field limit is well described by theory. At the discontinuity, it has been possible to determine the growth dynamics of the halo. The field dependence of the mobility also follows fairly accurately the theoretical description that takes into account ion recoil. The drift velocity non-linearities have put into evidence the equivalence of temperature and drift velocity in determining the ion mean energy.Less
The realization that ions of different size are produced in liquid 3He with different concentrations of 4He isotopic impurities has allowed researchers to select the ion to be studied just by changing the purity of the liquid. At about 70 mK, the positive ion mobility has a discontinuity related to the impossibility of further increase of an 4He-rich halo around the ion. Below the discontinuity, the temperature dependence of the mobility in the zero-field limit is well described by theory. At the discontinuity, it has been possible to determine the growth dynamics of the halo. The field dependence of the mobility also follows fairly accurately the theoretical description that takes into account ion recoil. The drift velocity non-linearities have put into evidence the equivalence of temperature and drift velocity in determining the ion mean energy.
A.F. Borghesani
- Published in print:
- 2007
- Published Online:
- January 2008
- ISBN:
- 9780199213603
- eISBN:
- 9780191707421
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213603.003.0022
- Subject:
- Physics, Condensed Matter Physics / Materials
The positive ion mobility in normal liquid 3He at low temperatures has long puzzled researchers because of its hysteretic behavior, until it was discovered that the ion structure induced by ...
More
The positive ion mobility in normal liquid 3He at low temperatures has long puzzled researchers because of its hysteretic behavior, until it was discovered that the ion structure induced by electrostriction depends on the isotopic composition of the liquid. Thermodynamic calculations show that the size of the positive ion radius varies depending on the amount of 4He impurities in the liquid. The puzzling hysteretic behavior has thus been attributed to the presence of ions of different radii.Less
The positive ion mobility in normal liquid 3He at low temperatures has long puzzled researchers because of its hysteretic behavior, until it was discovered that the ion structure induced by electrostriction depends on the isotopic composition of the liquid. Thermodynamic calculations show that the size of the positive ion radius varies depending on the amount of 4He impurities in the liquid. The puzzling hysteretic behavior has thus been attributed to the presence of ions of different radii.
