Ramsey Spectroscopy of the 2S_{1/2} Hyperfine Interval in Atomic Hydrogen.
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DOI: 10.1103/physrevlett.130.203001
Abstract: The 2S_{1/2} hyperfine interval in atomic hydrogen was measured using Ramsey spectroscopy with a thermal beam cooled to cryogenic temperatures. The measured value is 177 556 838.87(85) Hz, which represents the most precise determination of this interval to… read more here.
Keywords: hyperfine interval; spectroscopy; ramsey spectroscopy; interval atomic ... See more keywords