New Limits on the Drift of Fundamental Constants from Laboratory Measurements

摘要

We have remeasured the absolute 1S-2S transition frequency v_H 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 v_H with respect to the ground state hyperfine splitting v_(Cs) in ~(133)Cs. Combining this result with the recently published optical transition frequency in ~(199)Hg~+ against v_(Cs) and a microwave ~(87)Rb and ~(133)Cs clock comparison, we deduce separate limits on α/α = (-0.9 +- 2.9) x 10~(-15) yr~(-1) and the fractional time variation of the ratio of Rb and Cs nuclear magnetic moments μ_(Rb)/μ_(Cs) equal to (-0.5 +- 1.7) x 10~(-15) yr~(-1). The latter provides information on the temporal behavior of the constant of strong interaction.