Search results for "Solid hydrogen"

showing 3 items of 3 documents

Wetting behavior of solid hydrogen films

1996

We have studied the dewetting of quench-condensed solid hydrogen films on bare and Ne plated Ag substrates. Information about the morphology of the films during the dewetting process is obtained from measurements of photoelectron tunneling through the films and complementary surface plasmon resonance data. Plating the Ag substrate with Ne films of various thickness allows to tune the strength of the van der Waals interaction with the hydrogen and thus to change the H2 films from a state of incomplete to complete wetting.

Materials scienceHydrogenGeneral Physics and Astronomychemistry.chemical_elementNanotechnologySubstrate (electronics)symbols.namesakeChemical engineeringchemistrySolid hydrogenPlatingsymbolsWettingDewettingvan der Waals forceSurface plasmon resonanceCzechoslovak Journal of Physics
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Metal-Insulator Transition of Solid Hydrogen by the Antisymmetric Shadow Wave Function

2016

We revisit the pressure-induced metal-insulator-transition of solid hydrogen by means of variational quantum Monte Carlo simulations based on the antisymmetric shadow wave function. In order to facilitate studying the electronic structure of large-scale fermionic systems, the shadow wave function formalism is extended by a series of technical improvements, such as a revised optimization method for the employed shadow wave function and an enhanced treatment of periodic systems with long-range interactions. It is found that the superior accuracy of the antisymmetric shadow wave function results in a significantly increased transition pressure.

Quantum Monte CarloGeneral Physics and AstronomyFOS: Physical sciences02 engineering and technologyElectronic structure01 natural sciencesSuperconductivity (cond-mat.supr-con)Condensed Matter - Strongly Correlated ElectronsSolid hydrogen0103 physical sciencesShadowPhysical and Theoretical ChemistryMetal–insulator transition010306 general physicsWave functionMathematical PhysicsPhysicsCondensed Matter - Materials ScienceQuantum PhysicsStrongly Correlated Electrons (cond-mat.str-el)Antisymmetric relationCondensed Matter - SuperconductivityMaterials Science (cond-mat.mtrl-sci)Metallic hydrogenComputational Physics (physics.comp-ph)021001 nanoscience & nanotechnology3. Good healthQuantum electrodynamics0210 nano-technologyQuantum Physics (quant-ph)Physics - Computational Physics
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On dewetting dynamics of solid films of hydrogen isotopes and its influence on tritium [Beta] spectroscopy

2000

The dewetting dynamics of solid films of hydrogen isotopes, quench-condensed on a graphite substrate, was measured at various temperatures below desorption by observing the stray light from the film. A schematic model describing the dewetting process by surface diffusion is presented, which agrees qualitatively with our data. The activation energies of different hydrogen isotopes for surface diffusion were determined. The time constant for dewetting of a quench-condensed T2 film at the working temperature of 1.86 K of the mainz neutrino mass experiment was extrapolated.

Surface diffusionArrhenius equationMaterials scienceHydrogenpacs:68.45.Gdchemistry.chemical_elementCondensed Matter Physicspacs:23.40.-sElectronic Optical and Magnetic Materialssymbols.namesakeCondensed Matter::Materials SciencechemistryChemical physicsSolid hydrogenpacs:67.70.+nDesorptionsymbolsPhysical chemistryddc:530WettingDewettingPhysics::Atomic PhysicsSpectroscopypacs:67.80.Mg
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