Results 191 to 200 of about 32,472 (226)

Multielectron Bubbles in Liquid Helium

Journal of Low Temperature Physics, 2020
Multielectron bubbles (MEBs) are cavities in liquid helium that contain electrons and possibly vapour. They provide a versatile platform for exploring properties of interacting electrons in two dimensions in a regime of densities that has not been previously available.
Neha Yadav, Pranaya Kishore Rath, Zhuolin Xie, Yunhu Huang, Ambarish Ghosh   +4 more
openaire   +1 more source

Positronium bubble in liquid helium

Journal of Physics B: Atomic and Molecular Physics, 1976
Accurate positron lifetime measurements have been performed in liquid helium-4 under saturated vapour pressure between 4.2K and 1.5K. The annihilation rate of free positrons is found to be proportional to the density of helium, indicating that no clustering of atoms occurs around the positrons.
P Hautojarvi, K Rytsola, M T Loponen
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Hydrogen and helium bubbles in silicon

Materials Science and Engineering: R: Reports, 2000
Abstract Hydrogen is a quite common impurity in semiconductor-silicon technology: it is unintentionally but unavoidably added to the silicon after crystal growth during wafer processing, and continues to be present during wet oxidation, film depositions, etching and annealing steps.
G. F. Cerofolini, CORNI, Federico, FRABBONI, Stefano, NOBILI, Carlo Emanuele, OTTAVIANI, Giampiero, TONINI, Rita   +5 more
openaire   +1 more source

Nucleation of bubbles in liquid helium

Journal of Low Temperature Physics, 1993
We give a brief survey of experiments that have been performed to study the nucleation of bubbles in liquid helium at negative pressures.
H. J. Maris, S. Balibar, M. S. Pettersen
openaire   +1 more source

Liquid Helium Bubble Chamber

1960
In order to study liquid helium as a bubble chamber fluid, experiments have been performed on a small cylindrical chamber 4 inches long and 1–1/2 inch in diameter. 1 Results indicate that usable tracks can be formed throughout the operating pressure region from atmospheric pressure down to 200 mm Hg.
W. M. Fairbank, M. E. Blevins, M. M. Block, M. J. Buckingham, E. M. Harth, J. Leitner, G. G. Slaughter   +6 more
openaire   +1 more source

Helium bubble bursting in tungsten

Journal of Applied Physics, 2013
Molecular dynamics simulations have been used to systematically study the pressure evolution and bursting behavior of sub-surface helium bubbles and the resulting tungsten surface morphology. This study specifically investigates how bubble shape and size, temperature, tungsten surface orientation, and ligament thickness above the bubble influence ...
Faiza Sefta, Niklas Juslin, Brian D. Wirth   +2 more
openaire   +1 more source

Magnetic Properties of a Multielectron Bubble in Liquid Helium

Journal of Low Temperature Physics, 2005
Multielectron 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, Silvera, I.F., Devreese, Jozef   +2 more
openaire   +2 more sources

Helium bubbles in silicon: Structure and optical properties

Applied Physics Letters, 1995
Silicon 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., Weatherly, G. C., Haugen, H. K., Lockwood, D. J., Howe, L. M.   +4 more
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Infrared spectrum of the electron bubble in liquid helium

Physical Review B, 1990
Mesure 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, 1995
Electrons 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
openaire   +2 more sources