Electrons in Liquid Helium

Maris, Humphrey J.

doi:10.1143/jpsj.77.111008

Cited by 53 publications

(44 citation statements)

References 62 publications

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“…The free energy is represented by the zero-point energy of an electron in a square-well-potential, the surface energy represented by the product of surface tension s (P,T) and cavity surface and the volume displacement work of the liquid. 43 E cavity ¼ h 2 8mR 2 þ 4pR 2 s þ 4 3 pR 3 P ð5Þ The dashed line refers to calculated electron mobilities using the established 'bubble'-model and the solid line shows the results using our model.…”

Section: Discussionmentioning

confidence: 99%

Electron mobility in liquid and supercritical helium measured using corona discharges: a new semi-empirical model for cavity formation

Aitken

Bonifaci

et al. 2011

Phys. Chem. Chem. Phys.

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Electron mobilities in supercritical and liquid helium were investigated as a function of the density. The mobilities were derived from I(V) curves measured in a high-pressure cryogenic cell using a corona discharge in point-plane electrode geometry for charge generation. The presented data spans a wide pressure and temperature range due to the versatility of our experimental set-up. Where data from previous investigations is available for comparison, very good agreement is found. We present a semi-empirical model to calculate electron mobilities both in the liquid and supercritical phase. This model requires the electron-helium scattering length and thermodynamic state equations as the only input and circumvents any need to consider surface tension. Our semi-empirical model reproduces experimental data very well, in particular towards lower densities where transitions from localised to delocalised electron states were observed.

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Section: Discussionmentioning

confidence: 99%

Electron mobility in liquid and supercritical helium measured using corona discharges: a new semi-empirical model for cavity formation

Aitken

Bonifaci

et al. 2011

Phys. Chem. Chem. Phys.

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“…Knowledge of this structure has potential implications for cavitation in liquid helium mixtures. 36,37 Work is in progress to obtain the electron absorption energies in liquid helium mixtures.…”

Section: Discussionmentioning

confidence: 99%

Absorption spectrum of atomic impurities in isotopic mixtures of liquid helium

et al. 2011

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We theoretically describe the absorption spectrum of atomic impurities in isotopic mixtures of liquid helium within a zero-temperature density functional approach. Two situations are considered. In the first one, the absorption spectrum of Na atoms attached to 4 He 1000 -3 He N 3 droplets with N 3 values from 100 to 3000 is presented as a case study of an impurity that does not dissolve into helium droplets. In the second one, the absorption spectrum of Mg atoms in liquid 3 He-4 He mixtures is presented as a case study of an impurity dissolved into liquid helium. We have found that the absorption spectrum of the impurity is rather insensitive to the isotopic composition because the line shift is mostly affected by the total He density around the impurity, not by its actual composition. For bulk liquid mixtures, results are presented as a function of pressure at selected values of the 3 He concentration. The results for isotopically pure 3 He and 4 He liquids doped with Mg are compared with available experimental data.

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“…At given temperature (T ), there is a limiting (critical) pressure below which electron bubbles explode triggering liquid-gas phase separation. In the case of helium, this process is well known and the agreement between theory and experiment is very satisfactory [11,12].…”

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confidence: 94%

Cavitation of electron bubbles in liquid parahydrogen

et al. 2011

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Within a finite-temperature density functional approach, we have investigated the structure of electron bubbles in liquid parahydrogen below the saturated vapour pressure, determining the critical pressure at which electron bubbles explode as a function of temperature. The electron-parahydrogen interaction has been modelled by a Hartree-type local potential fitted to the experimental value of the conduction band-edge for a delocalized electron in pH(2). We have found that the pressure for bubble explosion is, in absolute value, about a factor of two smaller than that of the homogeneous cavitation pressure in the liquid. Comparison with the results obtained within the capillary model shows the limitations of this approximation, especially as temperature increases

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Electrons in Liquid Helium

Cited by 53 publications

References 62 publications

Electron mobility in liquid and supercritical helium measured using corona discharges: a new semi-empirical model for cavity formation

Electron mobility in liquid and supercritical helium measured using corona discharges: a new semi-empirical model for cavity formation

Absorption spectrum of atomic impurities in isotopic mixtures of liquid helium

Cavitation of electron bubbles in liquid parahydrogen

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