rf spectroscopy in an atomic fountain
- 7 August 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 63 (6) , 612-615
- https://doi.org/10.1103/physrevlett.63.612
Abstract
Laser-cooled sodium atoms pushed up on a vertical trajectory by radiation pressure are observed to turn around due to gravity. The reatively long time the atoms spent freely falling in this ‘‘atomic fountain’’ allowed the ground-state hyperfine splitting to be measured with a linewidth of 2 Hz. After a 1000-s integration time, the center of the line was resolved to ±10 mHz. The absolute splitting was measured to be 1 771 626 129(2) Hz.Keywords
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