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Magnetic Properties of a Multielectron Bubble in Liquid Helium
Journal of Low Temperature Physics, 2005Multielectron bubbles in liquid helium contain a spherical two-dimensional shell of electrons at the bubble surface. We investigate the properties of this electron gas when the bubble is placed in a homogeneous magnetic field. Results are reported for the Fermi level and the magnetization of the bubble.
Tempere, Jacques +2 more
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Helium bubbles in silicon: Structure and optical properties
Applied Physics Letters, 1995Silicon samples were implanted with 20 keV He at various temperatures. The damage and the size of the He bubbles created during the implantation were measured with Raman spectroscopy and transmission electron microscopy. Room temperature implantation with 2.5×1017 He atoms/ cm2 produced an amorphized layer with a high density of small voids (∼5 nm ...
Siegele, R. +4 more
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Infrared spectrum of the electron bubble in liquid helium
Physical Review B, 1990Mesure de l'energie de la transition de l'etat fondamental au premier etat excite dans des bulles generees par un exces d'electrons dans l'helium liquide. Le modele du puits carre-spherique prend bien en compte les energies de transition si la tension de surface effective est consideree comme independante de la pression.
, Grimes, , Adams
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Roton-pair creation by electron bubbles in helium
Physical Review B, 1995Electrons in superfluid helium form cavities that displace hundreds of atoms. These ``electron bubbles'' characteristically emit rotons in pairs when accelerated by an electric field. As no symmetry prevents the emission of single rotons, this has long been a mystery.
, Lenosky, , Elser
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Observation of Exploding Electron Bubbles in Liquid Helium
Physical Review Letters, 1996When an electron enters liquid helium, it experiences a repulsive potential V0 of approximately 1 eV [1]. As a consequence it is energetically favorable for the electron to become localized within a spherical volume from which the helium is nearly completely excluded [2].
, Classen, , Su, , Maris
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Helium-implanted silicon: A study of bubble precursors
Journal of Applied Physics, 1999The interaction of helium atoms with the radiation damage imparted to (100) silicon single crystal by He+ implantation at 5×1015 cm−2, 20 keV, and liquid–nitrogen temperature is investigated by means of various complementary techniques during and after thermal treatments.
CORNI, Federico +12 more
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Helium Bubble Growth in Vanadium
1981Helium bubble growth in vanadium has been investigated during postimplantation annealing at 950°C. The gas was introduced into 100-μm-thick specimens at room temperature by sequential ion implantation at 220, 140, 120, and 50 keV. This treatment provided a helium concentration of 5 × 1026 atoms/m3 at depths between 200 and 700 nm from the implanted ...
SK Tyler, PJ Goodhew
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Nucleation of bubbles in liquid helium at negative pressure
Physical Review Letters, 1989We consider the rate at which bubbles form when a negative pressure is applied to liquid $^{4}\mathrm{He}$. We show that at a critical pressure ${\mathrm{P}}_{\mathrm{c}}$ of about -9 bars, the liquid becomes macroscopically unstable and the barrier against nucleation of bubbles becomes zero.
, Maris, , Quan Xiong
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Numerical study of helium solubility and helium bubble stability in mercury
Annals of Nuclear Energy, 2013Abstract Dispersing small helium bubbles in the liquid mercury target of the high-power spallation neutron sources was proposed to add compressibility to the target made of liquid mercury. The pressure rise from proton beam deposition is reduced due to added compressibility, which in turn mitigates cavitation damage to the target boundary.
Bo Lu +2 more
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