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Showing 1 to 14 of 14 for “"solid hydrogen"”.
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Extrusion of Solid Hydrogen
Made available in DSpace on 2017-07-06T18:49:08Z (GMT). No. of bitstreams: 2 Kuhn_Thomas_R_MS.pdf: 16060935 bytes, checksum: eabeaf6e84659f75f53be1c9a0f83fe9 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1977
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Superfluid helium on solid hydrogen
We measure the third sound velocity of superfluid helium films as functions of temperature and film coverage on H$\sb2,$ D$\sb2,$ and Ar substrates. A new phase of superfluid is discovered on the weak-binding H$\sb2$ substrate. We observe, in addition to third sound, a new surface mode of wave …
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Theory of electronic polarization and localization in insulators with applications to solid hydrogen
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-05-30T21:08:19Z No. of bitstreams: 1 2000_souza.pdf: 10004108 bytes, checksum: 716e69c528de1e1ef2750ab5b725bb5d (MD5)
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A quantum Monte Carlo study of the high-pressure phases of solid hydrogen
… Carlo methods to the high pressure phases of solid hydrogen to elucidate those parts of the phase diagram where experimental results are inconclusive or lacking. The method allows us to treat both electrons and protons as quantum particles by incorporating them in the trial wavefunction and …
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A quantum Monte Carlo study of the high pressure phases of solid hydrogen
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-04-26T16:48:37Z Item is restricted indefinitely.
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Laser Heating of Solid Hydrogen for Production of Vibrationally Excited Molecules for Use in Negative Hydrogen Ion Sources
… performed in which laser light was used to heat hydrogen pellets on a metallic substrate. The purpose of heating the hydrogen is to create a vibrationally excited population of hydrogen for use in negative hydrogen ion sources. The desired heating temperature is 3000-6000 K.
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Theoretical Study on Magnetic Shielding of an Ablating Solid Hydrogen Pellet in a Plasma and Hydrogen Pellet Production and Injection Into the Apex Tokamak
The ablation rate of a solid hydrogen pellet in a plasma is the critical factor in determining the feasibility of pellet refueling of toroidal magnetically confined thermonuclear reactors. Initial experiments at Oak Ridge National Laboratory involving small pellets (diameter of order 200 (mu)m) and …
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Design, Optimization, and Testing of a Transaugmented Electromagnetic Railgun for Use as a Hydrogen Pellet Accelerator
… injection system may be capable of accelerating solid hydrogen pellets to high velocities.
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Schemes of ion acceleration employing high energy, petawatt laser pulses
… the first experiment, a target composed of a solid cryogenic hydrogen ribbon, 75- 100μm in thickness, was irradiated with pulses containing an energy of 300J, focused at intensities up to 5e20 W/cm2 . Proton beams, with no detectable contaminants, are reported on several ion diagnostics - …
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Stability and superconductivity of light-atom systems under extreme pressure
… superconductivity, which has been predicted in solid hydrogen and experimentally verified in numerous metal hydrides. This thesis adds to the knowledge of these high-pressure light-atom systems and introduces new tools for predicting their superconducting properties. It showcases the calculation …
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Investigating anharmonic effects in condensed matter systems
… anharmonic nuclear motion on the properties of solid materials from first principles. Such anharmonic effects can be significant in many cases. A vibrational self-consistent field (VSCF) method is used as the basis for these calculations, which is then improved and applied to a variety of solid …
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Electron-ion correlation and finite-size effects in quantum Monte Carlo simulations
… correction. We applied this method to solid hydrogen at megabar pressures and tackled additional problems involving geometry optimization and finite-size effects. The phase diagram produced by our electron-ion DMC simulations differ from previous DMC studies, showing 50 GPa higher …
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A theoretical study of molecular crystals
… extended, periodic, one-dimensional zigzag hydrogen fluoride chain was studied with this method and the energies, structures, harmonic, and anharmonic frequencies of the infrared- and/or Raman-active vibrations, phonon dispersions, and inelastic neutron scattering (INS) were calculated. A …
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Neutron scattering studies and simulations of hydrogen adsorption in single-walled carbon nanotubes
The storage of hydrogen is one of the main problems that needs to be solvedbefore hydrogen can become a real alternative to oil in mobile applications.Physisorption of hydrogen in an adsorbate is one of the possible solutions tothis problem.This thesis studies the adsorption of hydrogen in …