Objective
The project is intended to observe the superfluidity transition of spin-polarized atomic hydrogen adsorbed on the surface of liquid helium and to study elementary processes in such a weakly interacting two-dimensional Bose gas in the vicinity of and at the transition region. In order to achieve the required high surface densities of H atoms at temperatures below 200 mK, a small portion of the sample will be compressed into the potential well formed on the surface of superfluid helium by the highly inhomogeneous magnetic field at the end of a thin-walled tubular field intensifier. A bolometric measurement of the heat liberated in NMR-induced exchange recombinations will be employed to determine the surface density and to detect the appearance of the two-dimensional superfluid H component.
The project proposed here is encouraged by preliminary experiments carried out in 1994 where two-dimensional H was compressed magnetically to about half of the superfluid surface density. Then the compressed gas fraction was yet too large, 300 microns in diameter, to render a sufficiently effective extraction of recombination heat from it. In the proposed work the characteristic dimension of the densest H will be reduced by an order of magnitude and bulk superfluid He-4 will be used as adsorbate. Then the sample will not be excessively overheated.
The influence of the quasi-condensate formation on dipole-dipole interactions of H atoms will be studied by monitoring the heat liberated in recombinations induced by 190 GHz ESR directly in the compressed H. The dependence of heat exchange processes in surface-adsorbed H on the thickness of undersaturated helium-film substrate will also be investigated as well as the influence of the superfluid H component on the interaction between H atoms and undersaturated He films.
The results of this project are anticipated to be of such importance that they can be published in high-impact international scientific journals and emanated also in international meetings.
Fields of science (EuroSciVoc)
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Programme(s)
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Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
20014 Turku
Finland
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.