Cold Collision Frequency Shift of the 1S-2S Transition in Hydrogen

Details Cold Collision Frequency Shift of the 1S-2S Transition in Hydrogen Cold Collision Frequency Shift of the 1S-2S Transition in Hydrogen

1998-09-11

arxiv.org/abs/physics/9809016v2

Physics

Atomic Physics

Accepted for publication in PRL, 9 pages, 4 PostScript figures, ReVTeX. Updated connection of our measurement to theoretical w

Scientific paper

10.1103/PhysRevLett.81.3807

We have observed the cold collision frequency shift of the 1S-2S transition in trapped spin-polarized atomic hydrogen. We find $\Delta \nu_{1S-2S} = -3.8(8)\times 10^{-10} n Hz cm^3$, where $n$ is the sample density. From this we derive the 1S-2S s-wave triplet scattering length, $a_{1S-2S}=-1.4(3)$ nm, which is in fair agreement with a recent calculation. The shift provides a valuable probe of the distribution of densities in a trapped sample.

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