Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of the 1S-2S transition, we obtain 670994334606(15) Hz. This is a 10-times improvement over the previous best measurement confirming its frequency value. a calculation of the difference of the mean square charge radii of deuterium and hydrogen results in r2d-r2 p=3.82007(65)fm2, a more than twofold improvement compared to the former value.
C. G. Parthey et al., "Precision Measurement of the Hydrogen-Deuterium 1S-2S Isotope Shift," Physical Review Letters, American Physical Society (APS), Jan 2010.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.104.233001
Marie Curie Intra European Grant
Max Planck Foundation
National Institute of Standards and Technology
National Science Foundation (U.S.)
Keywords and Phrases
Isotope Shifts; Mean Square; Precision Measurement; Two-Photon Spectroscopy
Article - Journal
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