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Continuous-wave two-photon spectroscopy of the 1S-2S transition in hydrogen

Journal Article · · Phys. Rev. Lett.; (United States)
We have observed the 1S-2S transition in atomic hydrogen gas with a resolution of 5 parts in 10/sup 9/ by Doppler-free two-photon spectroscopy, using multimilliwatt cw radiation near 243 nm generated by sum-frequency mixing. The experiment opens the way to substantial increases in the accuracy of the Rydberg constant, the electron/proton mass ratio, and the Lamb shift of the Hydrogen 1S ground state.
Research Organization:
Department of Physics, Stanford University, Stanford, California 94305
OSTI ID:
5772223
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 54:17; ISSN PRLTA
Country of Publication:
United States
Language:
English