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

Abstract

We have observed the cold collision frequency shift of the 1S-2S transition in trapped spin-polarized atomic hydrogen. We find $\Delta {\nu }_{1S-2S}=-3.8(8)\times 10^{-10}nHzc{m}^3$, 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.

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

References in corpus (1)

• Bose-Einstein Condensation of Atomic Hydrogen

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