Cold Collision Frequency Shift in Two-Dimensional Atomic Hydrogen

Details Cold Collision Frequency Shift in Two-Dimensional Atomic Hydrogen Cold Collision Frequency Shift in Two-Dimensional Atomic Hydrogen

2006-10-27

arxiv.org/abs/cond-mat/0610766v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.043004

We report a measurement of the cold collision frequency shift in atomic hydrogen gas adsorbed on the surface of superfluid 4He at T<=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 v_c = -1.0(1)x10^-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 3D case.

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