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Electron mobility in liquid and supercritical helium measured using corona discharges : a new semi-empirical model for cavity formation

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journal contribution
posted on 23.08.2011, 15:36 by F. Aitken, Z.-L. Li, N. Bonifaci, A. Denat, Klaus von Haeften
Electron mobilities in supercritical and liquid helium were investigated as a function of the density. The mobilities were derived from I(V) curves measured in a high-pressure cryogenic cell using a corona discharge in point-plane electrode geometry for charge generation. The presented data spans a wide pressure and temperature range due to the versatility of our experimental set-up. Where data from previous investigations is available for comparison, very good agreement is found. We present a semi-empirical model to calculate electron mobilities both in the liquid and supercritical phase. This model requires the electron–helium scattering length and thermodynamic state equations as the only input and circumvents any need to consider surface tension. Our semi-empirical model reproduces experimental data very well, in particular towards lower densities where transitions from localised to delocalised electron states were observed.

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Citation

Physical Chemistry Chemical Physics, 2010, 13 (2), pp. 719-724.

Version

VoR (Version of Record)

Published in

Physical Chemistry Chemical Physics

Publisher

Royal Society of Chemistry (RSC)

issn

1463-9076

eissn

1463-9084

Copyright date

2011

Available date

23/08/2011

Publisher version

http://pubs.rsc.org/en/Content/ArticleLanding/2011/CP/c0cp00786b

Language

en

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