Phys. Rev. Lett. 81, 3807–3810 (1998)Cold Collision Frequency Shift of the 1S- 2S Transition in HydrogenReceived 11 September 1998; published in the issue dated 2 November 1998 We have observed the cold collision frequency shift of the 1S- 2S transition in trapped spin-polarized atomic hydrogen. We find Δν1S-2S = -3.8±0.8×10-10nHzcm3, where n is the sample density. From this we derive the 1S- 2S s-wave triplet scattering length, a1S-2S = -1.4±0.3nm, which is in fair agreement with a recent calculation. The shift provides a valuable probe of the distribution of densities in a trapped sample. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.3807
DOI:
10.1103/PhysRevLett.81.3807
PACS:
32.70.Jz, 06.30.Ft, 32.80.Cy, 34.10.+x
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