Mobilities of He Ions in Liquid Helium

Meyer, Lothar; Reif, Frederick

doi:10.1103/physrev.110.279

Cited by 172 publications

(37 citation statements)

References 4 publications

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“…On bound optical excitation, thermal energy is released (Jahn-Teller effect) as the environment distorts spontaneously to lift the degeneracy of the excited p state (the populated-state energy is lowered by the distortion). The localized thermal energy generated in this relaxation can release the bubble from its vortex trap; its mobility then increases until retrapping (Fowler and Dexter, 1968;Miyakawa and Dexter, 1970). In the absence of vortices, no such effect is observed for T > T k .…”

Section: A Bulk Effectsmentioning

confidence: 99%

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Electron self-trapping in liquids and dense gases

Hernandez

1991

Rev. Mod. Phys.

139

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The basic physics regarding self-trapping of light particles in simple fluid hosts is reviewed pedagogically. Electron and positronium self-trapping in fluid helium is taken as a historical starting point. The theoretical context consists of simplified continuum models with averaged interactions, but required improvements are discussed. Experimental examples are chosen to illustrate bulk, surface, and impurity effects. Equilibrium and dynamical aspects of the field are illustrated. In noting applications to more complex systems, reference is made to recent developments using path-integral and computer simulation methods. The article spans certain aspects of studies in this fascinating area over the last 30 years.

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Section: A Bulk Effectsmentioning

confidence: 99%

“…Meyer and Reif (1958) measured the electron mobility in liquid helium (below 4 K) and found it to be extremely small. Careri, Scaramuzzi, and Thompson (1959) confirmed the measurements and indeed mentioned the word "bubble" in trying to understand their results.…”

Section: A Bulk Effectsmentioning

confidence: 99%

Electron self-trapping in liquids and dense gases

Hernandez

1991

Rev. Mod. Phys.

139

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“…[7][8][9][10][11] But whether clusters exist at low temperatures above T c is currently an open question. Measurements of positive ion mobility in the supercritical phase could shed light on this issue, but to the best of our knowledge no data is available to date.…”

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confidence: 99%

Formation of Positively Charged Liquid Helium Clusters in Supercritical Helium and their Solidification upon Compression

Tarchouna

Bonifaci

Aitken

et al. 2015

J. Phys. Chem. Lett.

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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

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“…Mobility measurements of positively charged ions in liquid helium conducted about 50 years ago revealed an unusually large hydrodynamic radius of the ions [1,2]. Atkins explained this phenomenon by ions that would attract neutral helium by electrostriction and form positively charged, solid like clusters -frequently referred to as 'Atkins snowballs' [3,4].…”

Section: Introductionmentioning

confidence: 99%

Mobility of positively charged ions in supercritical helium

Tarchouna

Aitken

Bonifaci

et al. 2014

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)

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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.

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Mobilities of He Ions in Liquid Helium

Cited by 172 publications

References 4 publications

Electron self-trapping in liquids and dense gases

Electron self-trapping in liquids and dense gases

Formation of Positively Charged Liquid Helium Clusters in Supercritical Helium and their Solidification upon Compression

Mobility of positively charged ions in supercritical helium

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