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Ions and electrons in liquid helium$
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Armando Francesco Borghesani

Print publication date: 2007

Print ISBN-13: 9780199213603

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780199213603.001.0001

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ELECTRON MOBILITY IN DENSE HE GAS

ELECTRON MOBILITY IN DENSE HE GAS

Chapter:
(p.454) 27 ELECTRON MOBILITY IN DENSE HE GAS
Source:
Ions and electrons in liquid helium
Author(s):

A.F. Borghesani

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199213603.003.0027

Experiments on the mobility of electrons in dense helium gas elucidated how localized electron states develop when the gas density gas is increased. Up to 77 K, the density dependence of the mobility clearly shows that the formation of electron bubbles is a continuous phenomenon. Localization of electrons in bubbles also appears at high temperatures if the density is so large that the free energy of the localized state is negative enough. Percolation and hydrodynamic models have been devised to explain the continuous transition from high-mobility states to low-mobility states. It is shown that density-dependent, quantum multiple scattering effects modify the energy of the nearly free electron in a way that can be accurately described by heuristically modifying the kinetic theory prediction.

Keywords:   electron mobility, self-trapping, localized states, Fermi shift, quantum multiple scattering effects, hydrodynamic mobility, percolation, Anderson localization

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