Explanation of 100-fold reduction of spectral shifts for hydrogen on helium films

Details Explanation of 100-fold reduction of spectral shifts for hydrogen on helium films Explanation of 100-fold reduction of spectral shifts for hydrogen on helium films

2008-04-09

arxiv.org/abs/0804.1543v1

Phys. Rev. Lett. 101, 165301 (2008)

Physics

Condensed Matter

Other Condensed Matter

4+ pages, 1 figure (3 subfigures), revtex4

Scientific paper

10.1103/PhysRevLett.101.165301

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. These attractive interactions also explain the anomalous dependence of the cold collision frequency shifts on the $^3$He covering of the film. Our findings suggest that the gas will become mechanically unstable before reaching the Kosterlitz-Thouless transition unless the experiment is performed in a drastically different regime, for example with a much different helium film geometry.

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