Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.233001
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Funding
- Marie Curie Intra European grant
- NSF
- NIST
- RSSF [MD-887.2008.2]
- Max Planck Foundation
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Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of the 1S - 2S transition, we obtain 670 994 334 606(15) Hz. This is a 10-times improvement over the previous best measurement [A. Huber et al., Phys. Rev. Lett. 80, 468 (1998)] confirming its frequency value. A calculation of the difference of the mean square charge radii of deuterium and hydrogen results in < r(2)>(d) - < r(2)>(p) = 3.820 07(65) fm(2), a more than twofol( improvement compared to the former value.
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