caa a22 4500 445366044 CHVBK 20180317142930.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0325-x doi (NATIONALLICENCE)springer-10.1007/s10909-010-0325-x A Macroscopic Approach to Determine Electron Mobilities in Low-Density Helium [Elektronische Daten] [F. Aitken, N. Bonifaci, A. Denat, K. von Haeften] We have developed a macroscopic approach to predict electron mobilities and cavity sizes in liquid and supercritical helium using the free-volume concept. We demonstrate very good agreement with experimental electron mobility data and significant improvement with respect to the commonly used ‘bubble' model, especially for low hydrostatic pressures. The reason for this advancement is the use of heuristically developed thermodynamic state laws that account for the variations with density, temperature, and the isothermal compressibility of dense helium. The state equation uses the scattering length as input and parameters that are adjusted to experimental data. The conventional ‘bubble' method is based on the surface tension which is not defined for all accessible thermodynamic states. We investigate the limit of very low densities, with Knudsen numbers larger than 1.5. Here, the mobilities predicted by our method coincide well with experimental data until the mobility diverges abruptly. This behaviour is interpreted as a cross-over from Stokes-flow to gas kinetics behaviour. Springer Science+Business Media, LLC, 2010 Electron mobility in liquid and supercritical helium nationallicence Aitken F. G2ELab-CNRS, 25 rue des Martyrs, 38042, Grenoble, France aut Bonifaci N. G2ELab-CNRS, 25 rue des Martyrs, 38042, Grenoble, France aut Denat A. G2ELab-CNRS, 25 rue des Martyrs, 38042, Grenoble, France aut von Haeften K. Department of Physics & Astronomy, University of Leicester, LE1 7RH, Leicester, UK aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 702-709 0022-2291 162:5-6<702 2011 162 10909 https://doi.org/10.1007/s10909-010-0325-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0325-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aitken F. G2ELab-CNRS, 25 rue des Martyrs, 38042, Grenoble, France aut NATIONALLICENCE 700 1- Bonifaci N. G2ELab-CNRS, 25 rue des Martyrs, 38042, Grenoble, France aut NATIONALLICENCE 700 1- Denat A. G2ELab-CNRS, 25 rue des Martyrs, 38042, Grenoble, France aut NATIONALLICENCE 700 1- von Haeften K. Department of Physics & Astronomy, University of Leicester, LE1 7RH, Leicester, UK aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 702-709 0022-2291 162:5-6<702 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer