Ion mobility in liquid He[superscript 3] below 1°K
Kuchnir, Moyses
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https://hdl.handle.net/2142/25050
Description
Title
Ion mobility in liquid He[superscript 3] below 1°K
Author(s)
Kuchnir, Moyses
Issue Date
1966
Doctoral Committee Chair(s)
Wheatley, J.C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
ion mobility
liquid helium
low temperature below 1 Kelvin
Language
en
Abstract
"The low field mobility of positive and negative ions in
liquid He 3 was measured for temperatures between 0.03°K and 10K and
pressures of 27.9 atm, 7.5 atm, and less than 0.35 atm. Ions in the
liquid were produced by a radioactive tritiated titanium source and
their mobility was obtained by directly measuring their drift velocity
using a time of flight technique which involved a multigrid system
of electrodes. Details of the experimental procedures as well as of
the experimental apparatus and its construction are given.
The positive ion mobility, ~+, was found to be larger than
the negative, ~_, except at 27.9 atm above 0.3°K, where both are ~ 0.036
2
cm Iv sec. By increasing the pressure, ~ was observed to increase
while ~+ decreased. Furthermore, ~_ was found to be a continuous function
of the temperature, reproducible within 1% throughout the entire
temperature range of the measurements, while ~+ presented hysteresis
in a temperature range that depended on the pressure. The experimental
results are presented in both,graph and table forms.The systematic error involved in the absolute value of the mobility is
less than 10%.
The ""cluster"" model for the positive ion and the ""bubble"" model
for the negative ion in liquid helium are discussed in some detail and
3 applied for liquid He. The temperature and pressure dependence of ll_
between 0.03°K and 0.07°K is in agreement with the theoretical prediction
for the mobility of an electron localized in a bubble that undergoes
Brownian motion in a Fermi gas. No theoretical calculation available
predicts ll_ between 0.07°i< and 10K or ll+ correctly."
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