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Title: Formation of Positively Charged Liquid Helium Clusters in Supercritical Helium and their Solidification Upon Compression
Authors: Gharbi Tarchouna, H.
Bonifaci, N.
Aitken, F.
Mendoza Luna, Luis Guillermo
von Haeften, Klaus
First Published: 15-Jul-2015
Publisher: American Chemical Society
Citation: Journal of Physical Chemistry Letters, 2015, 6, pp. 3036-3040 (5)
Abstract: Positively charged ions were produced in supercritical helium at temperatures from 6 to 10 K and up to 2 MPa using a corona discharge. Their mobility was measured via currentvoltage curves and the hydrodynamic radius was derived using Stokes law. An initial increase and subsequent decrease of hydrodynamic radius was observed and interpreted in terms of growth, compression and solidification of ion clusters. The mobility was modelled using a van der Waals-type thermodynamic state equation for the ion-in-helium mixed system and a temperature-dependent Millikan-Cunningham factor, describing experimental data both in the Knudsen and the Stokes flow region. Regions of maximum hydrodynamic radius and large 1 compressibility were interpreted as boiling points. These points were modelled over a large range of pressures and found to match the Frenkel line of pure helium up to 0.7 MPa, reflecting similarity of density fluctuations in pure supercritical helium and gas-liquid phase transitions of ionic helium clusters.
DOI Link: 10.1021/acs.jpclett.5b01159
eISSN: 1948-7185
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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