Results 21 to 30 of about 32,253 (225)

Coalescence of helium bubbles in aluminum [PDF]

Journal of Nuclear Materials, 1974
Abstract The formation and coalescence of helium bubbles in aluminum with annealing at 550°C is examined experimentally using electrical resistivity and electron microscopy. Results for the kinetics of coalescence are compared with those obtained by computer simulation in order to test models based upon various mechanisms for bubble motion.
K.Y. Chen, J.R. Cost
openaire   +3 more sources

Tungsten evolution under helium irradiation: Shape of bubbles by TEM and in-situ GISAXS analysis

Nuclear Materials and Energy, 2023
The evolution of the tungsten microstructure and properties under helium irradiation could cause problems for both operational and safety reasons in fusion reactors.
L. Corso, S. Curiotto, E. Bernard, M. Cabie, C. Martin, L. Martinelli, F. Cheynis, P. Muller, F. Leroy   +8 more
doaj   +1 more source

Spectroscopy of Nonspherical Atomic Bubbles in Solid Helium [PDF]

The Journal of Physical Chemistry A, 2011
We analyze the effect of the host crystal symmetry on the optical spectra of the 6P(1/2)-6S(1/2) and 6P(3/2)-6S(1/2) transitions of atomic Cs in solid (4)He matrices. In particular, we address the deformation of the bubble structures formed by Cs in such quantum crystals.
Lebedev V, Moroshkin P, Weis A
openaire   +2 more sources

Rb*He_n exciplexes in solid 4_He [PDF]

, 2006
We report the observation of emission spectra from Rb*He_n exciplexes in solid 4He. Two different excitation channels were experimentally identified, viz., exciplex formation via laser excitation to the atomic 5P3/2 and to the 5P1/2 levels.
Hofer, A., Moroshkin, P., Nettels, D., Ulzega, S., Weis, A.   +4 more
core   +2 more sources

Sonoluminescence and collapse dynamics of multielectron bubbles in helium [PDF]

, 2004
Multielectron bubbles (MEBs) differ from gas-filled bubbles in that it is the Coulomb repulsion of a nanometer thin layer of electrons that forces the bubble open rather than the pressure of an enclosed gas.
A. P. Volodin, A. P. Volodin, D. Hammer, F. Takemura, I. F. Silvera, J. T. Devreese, J. Tempere, L. P. Gor’kov, L. P. Gor’kov, Lord Rayleigh, O. Baghdassarian, S. Rekhi, V. B. Shikin, V. B. Shikin   +13 more
core   +1 more source

The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions

Scientific Reports, 2017
Tungsten is a promising plasma facing material for fusion reactors. Despite many favorable properties, helium ions incoming from the plasma are known to dramatically affect the microstructure of tungsten, leading to bubble growth, blistering, and/or to ...
Danny Perez, Luis Sandoval, Sophie Blondel, Brian D. Wirth, Blas P. Uberuaga, Arthur F. Voter   +5 more
doaj   +1 more source

Wigner lattice of ripplopolarons in a multielectron bubble in helium

, 2003
The properties of ripplonic polarons in a multielectron bubble in liquid helium are investigated on the basis of a path-integral variational method.
Devreese, J. T., Klimin, S. N., Silvera, I. F., Tempere, J.   +3 more
core   +2 more sources

TEM investigation of helium bubble evolution in tungsten and ZrC-strengthened tungsten at 800 and 1000°C under 40keV He+ irradiation

Nuclear Engineering and Technology
Helium-induced defect nucleation and accumulation in polycrystalline W and W0.5 wt%ZrC (W0.5ZrC) were studied in-situ using the transmission electron microscopy (TEM) combined with 40 keV He+ irradiation at 800 and 1000°С at the maximum damage level of 1
I. Ipatova, G. Greaves, D. Terentyev, M.R. Gilbert, Y.-L. Chiu   +4 more
doaj   +1 more source

Evidence of a temperature transition for denuded zone formation in nanocrystalline Fe under He irradiation

Materials Research Letters, 2017
Nanocrystalline materials are radiation-tolerant materials’ candidates due to their high defect sink density. Here, nanocrystalline iron films were irradiated with 10 keV helium ions in situ in a transmission electron microscope at elevated temperatures.
O. El-Atwani, J. E. Nathaniel, A. C. Leff, J. K. Baldwin, K. Hattar, M. L. Taheri   +5 more
doaj   +1 more source

Excited electron-bubble states in superfluid helium-4: a time-dependent density functional approach

, 2010
We present a systematic study on the excited electron-bubble states in superfluid helium-4 using a time-dependent density functional approach. For the evolution of the 1P bubble state, two different functionals accompanied with two different time ...
Dafei Jin, David Mateo, Landau L., Manuel Barranco, Martí Pi, Ralston A., Weissbluth M.   +6 more
core   +1 more source