Helium Ionization in the Diffuse Ionized Gas surrounding UCHII regions [PDF]
, 2017 We present measurements of the singly ionized helium to hydrogen ratio ($n_{He^+}/n_{H^+}$) toward diffuse gas surrounding three Ultra-Compact HII (UCHII ) regions: G10.15-0.34, G23.46-0.20 \& G29.96-0.02.
Anderson, L. D. +2 more
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Key mechanistic features of swelling and blistering of helium-ion-irradiated tungsten [PDF]
, 2019 Helium-ion-induced swelling and blistering of single-crystal tungsten is investigated using a Helium Ion Microscope for site-specific dose-controlled irradiation (at 25 keV) with analysis by Helium Ion Microscopy, Atomic Force Microscopy and Transmission
Allen, FI, Balooch, M, Hosemann, P
core +3 more sources
Properties of Dense Fluid Hydrogen and Helium in Giant Gas Planets [PDF]
, 2006 Equilibrium properties of hydrogen-helium mixtures under thermodynamic conditions found in the interior of giant gas planets are studied by means of density functional theory molecular dynamics simulations.
Burrows +14 more
core +3 more sources
Semiclassical approach to the line shape [PDF]
, 2010 We extend the results of Bakalov D., B.Jeziorski, T.Korona, K.Szalewicz, E.Tchoukova, Phys. Rev. Lett. {\bf 84} (2000) 2350, on one-photon electric dipole transition line shift and broadening to the case of two-photon transitions.
Stoilov, M. N.
core +2 more sources
Sequestration of noble gases in giant planet interiors [PDF]
Phys.Rev.Lett.104:121101,2010, 2010 The Galileo probe showed that Jupiter's atmosphere is severely depleted in neon compared to protosolar values. We show, via ab initio simulations of the partitioning of neon between hydrogen and helium phases, that the observed depletion can be explained
Burkhard Militzer +2 more
core +2 more sources
Spectroscopy and Dynamics of a Two-Dimensional Electron Gas on top of Ultrathin Helium Films on Cu(111) [PDF]
Phys. Rev. Lett. 116, 256801 (2016), 2016 Electrons in image-potential states on the surface of bulk helium represent a unique model system of a two-dimensional electron gas. Here, we investigate their properties in the extreme case of reduced film thickness: a monolayer of helium physisorbed on
Armbrust, Nico +4 more
core +2 more sources
Explanation of 100-fold reduction of spectral shifts for hydrogen on helium films [PDF]
Phys. Rev. Lett. 101, 165301 (2008), 2008 We show that helium film-mediated hydrogen-hydrogen interactions account for a two orders of magnitude discrepancy between previous theory and recent experiments on cold collision shifts in spin-polarized hydrogen adsorbed on a helium film.
Erich J. Mueller +2 more
core +2 more sources
Reducing the hydrogen content in liquid helium [PDF]
, 2020 Helium has the lowest boiling point of any element in nature at normal atmospheric pressure. Therefore, any unwanted substance like impurities present in liquid helium will be frozen and will be in solid form. Even if these solid impurities can be easily eliminated by filtering, liquid helium may contain a non-negligible quantity of molecular hydrogen.
arxiv +1 more source
Models of helium enrichment in helium-rich gas reservoirs of petroliferous basins in China
Natural Gas Industry B, 2023 Owing to the characteristics of chemical inertness, low molecular weight, low boiling point, strong permeability and high heat conductivity, helium is extensively used in the fields of aerospace, low-temperature superconductivity, medicine and high tech,
Shengfei Qin +4 more
doaj
Arc pressure and weld metal fluid flow whilst using alternating shielding gases Part 2 : arc force determination [PDF]
, 2013 The transient variation of the shielding gas present in the alternating shielding gas process produces a dynamic action within the liquid weld metal. Flow vectors opposite in direction have been reported due to the various forces acting on the weld metal
Campbell, Stuart +2 more
core +1 more source