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Improved Measurement of the Hydrogen 1S - 2S Transition Frequency
Hydrogen 1S - 2S Transition Frequency atomic hydrogen photon spectroscopy
2011/8/4
Abstract: We have measured the 1S - 2S transition frequency in atomic hydrogen via two photon spectroscopy on a 5.8 K atomic beam. We obtain $f_{1S-2S} = 2 466 061 413 187 035 (10)$ Hz for the hyperfi...