We have remeasured the absolute 1S-2S transition frequency νH in atomic hydrogen. A comparison with the result of the previous measurement performed in 1999 sets a limit of (-29 ± 57) Hz for the drift of νH with respect to the ground state hyperfine splitting νCs in 133Cs. Combining this result with the recently published optical transition frequency in 199Hg+ against νCs and a microwave 87Rb and 133Cs clock comparison, we deduce separate limits on α˙ / α = (-0.9 &plusm; 2.9) x 10-15 yr-1 and the fractional time variation of the ratio of Rb and Cs nuclear magnetic moments μRb / μCs equal to (-0.5 &plusm; 1.7) x 10-15 yr-1. The latter provides information on the temporal behavior of the constant of strong interaction.
"New Limits on the Drift of Fundamental Constants from Laboratory Measurements," Physical Review Letters, vol. 92, no. 23, American Physical Society (APS), Jun 2004.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.92.230802
Keywords and Phrases
Atomic Physics; Cesium; Cooling; Frequencies; Ground State; Hydrogen; Light Absorption; Magnetic Moments; Photodiodes; Rubidium; Ultrahigh Vacuum; Ultraviolet Radiation
International Standard Serial Number (ISSN)
Article - Journal
© 2004 American Physical Society (APS), All rights reserved.