dorsal/arxiv
View SchemaCold Collision Frequency Shift of the 1S-2S Transition in Hydrogen
| Authors | Thomas C. Killian, Dale. G. Fried, Lorenz Willmann, David Landhuis, Stephen C. Moss, Thomas J. Greytak, Daniel Kleppner |
|---|---|
| Categories | |
| ArXiv ID | physics/9809016 |
| URL | https://arxiv.org/abs/physics/9809016 |
| DOI | 10.1103/PhysRevLett.81.3807 |
Abstract
We have observed the cold collision frequency shift of the 1S-2S transition in trapped spin-polarized atomic hydrogen. We find $\Delta \nu_{1S-2S} = -3.8(8)\times 10^{-10} n Hz cm^3$, 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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"date_created": "2026-03-02T18:01:21.911000Z",
"date_modified": "2026-03-02T18:01:21.911000Z",
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"abstract": "We have observed the cold collision frequency shift of the 1S-2S transition\nin trapped spin-polarized atomic hydrogen. We find $\\Delta \\nu_{1S-2S} =\n-3.8(8)\\times 10^{-10} n Hz cm^3$, where $n$ is the sample density. From this\nwe derive the 1S-2S s-wave triplet scattering length, $a_{1S-2S}=-1.4(3)$ nm,\nwhich is in fair agreement with a recent calculation. The shift provides a\nvaluable probe of the distribution of densities in a trapped sample.",
"arxiv_id": "physics/9809016",
"authors": [
"Thomas C. Killian",
"Dale. G. Fried",
"Lorenz Willmann",
"David Landhuis",
"Stephen C. Moss",
"Thomas J. Greytak",
"Daniel Kleppner"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevLett.81.3807",
"title": "Cold Collision Frequency Shift of the 1S-2S Transition in Hydrogen",
"url": "https://arxiv.org/abs/physics/9809016"
},
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