Thermal compression of atomic hydrogen on helium surface
Abstract
We describe experiments with spin-polarized atomic hydrogen gas adsorbed on liquid He surface. The surface gas density is increased locally by thermal compression up to cm at 110 mK. This corresponds to the onset of quantum degeneracy with the thermal de-Broglie wavelength being 1.5 times larger than the mean interatomic spacing. The atoms were detected directly with a 129 GHz electron-spin resonance spectrometer probing both the surface and the bulk gas. This, and the simultaneous measurement of the recombination power, allowed us to make accurate studies of the adsorption isotherm and the heat removal from the adsorbed hydrogen gas. From the data, we estimate the thermal contact between 2D hydrogen gas and phonons of the helium film. We analyze the limitations of the thermal compression method and the possibility to reach the superfluid transition in 2D hydrogen gas.
Keywords
Cite
@article{arxiv.cond-mat/0610808,
title = {Thermal compression of atomic hydrogen on helium surface},
author = {J. Järvinen and J. Ahokas and S. Vasiliev},
journal= {arXiv preprint arXiv:cond-mat/0610808},
year = {2009}
}
Comments
20 pages, 11 figures