What is it about?
Positively charged helium clusters, also called ‘snowballs’, have been investigated within normal liquid helium. Thermodynamic state equations for ionic helium clusters in liquid helium have been developed, allowing us to discern the ‘hydrodynamic’ radius for a wide range of hydrostatic pressures and temperatures. The mobilities derived from the cluster sizes using Stokes law match experimental data with unsurpassed accuracy. For low pressures the compressibility of the cluster ions was found to be distinctly larger than the compressibility of solid helium suggesting that in this pressure range clusters are fully or partially liquid.
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Perspectives
The model can be easily transposed to the mobility of other types of ions in different liquids.
Dr Frédéric AITKEN
Laboratoire de Genie Electrique de Grenoble
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This page is a summary of: Modelling the mobility of positive ion clusters in normal liquid helium over large pressure ranges, Physical Chemistry Chemical Physics, January 2015, Royal Society of Chemistry,
DOI: 10.1039/c5cp02539g.
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