AI Article Synopsis
- The study measures how cold collisions between hydrogen atoms change when they are on the surface of superfluid helium at very low temperatures (below 90 mK).
- Using advanced techniques in magnetic resonance, the researchers distinguish the effects of different interactions on the resonance shifts based on the density of hydrogen atoms on the surface.
- The observed frequency shift was much smaller than what previous theories predicted, which could change our understanding of atomic behavior in such environments.
Article Abstract
We report a measurement of the cold collision frequency shift in atomic hydrogen gas adsorbed on the surface of superfluid (4)He at T approximately < 90 mK. Using two-photon electron and nuclear magnetic resonance in 4.6 T field we separate the resonance line shifts due to the dipolar and exchange interactions, both proportional to surface density sigma. We find the clock shift Delta nu(c) = -1.0(1) x 10(-7) Hz cm(-2) x sigma, which is about 100 times smaller than the value predicted by the mean field theory and known scattering lengths in the three-dimensional case.
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| http://dx.doi.org/10.1103/PhysRevLett.98.043004 | DOI Listing |
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