Title :
Mobility of positively charged ions in supercritical helium
Author :
Tarchouna, H.G. ; Aitken, F. ; Bonifaci, N. ; von Haeften, K. ; Eloranta, J.
Author_Institution :
G2ELab, Univ. Grenoble Alpes, Grenoble, France
fDate :
June 29 2014-July 3 2014
Abstract :
The mobility of positively charged ions in supercritical helium at temperatures from 6 to 11 K and up to 20 bar was measured using corona discharges. Regions of increased and decreased hydrodynamic radius are interpreted in terms of growth, compression and solidification of ion clusters. Modelling of the mobility using a thermodynamic state equation for the ion-helium mixed system and a temperature dependent Cunningham correction provides best match with experimental data for a van der Waals helium-ion interaction term. Regions of large hydrodynamic radius and large compressibility are attributed to liquid-like behaviour.
Keywords :
compressibility; corona; helium; hydrodynamics; ion mobility; liquid helium; solidification; van der Waals forces; He; compressibility; compression; corona discharges; hydrodynamic radius; ion clusters; liquid-like behaviour; positively charged ion mobility; pressure 20 bar; solidification; supercritical helium; temperature 6 K to 11 K; temperature dependent Cunningham correction; thermodynamic state equation; van der Waals helium-ion interaction; Biochemistry; Electrodes; Helium; Liquids; Solid modeling; Solids; Temperature distribution; Corona discharge; Positive ions mobility in supercritical helium;
Conference_Titel :
Dielectric Liquids (ICDL), 2014 IEEE 18th International Conference on
Conference_Location :
Bled
DOI :
10.1109/ICDL.2014.6893171
