New limits on the drift of fundamental constants from laboratory measurements -: art. no. 230802

We have remeasured the absolute 1S-2S transition frequency nu(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 nu(H) with respect to the ground state hyperfine splitting nu(Cs) in Cs-133. Combining this result with the recently published optical transition frequency in Hg-199(+) against nu(Cs) and a microwave Rb-87 and Cs-133 clock comparison, we deduce separate limits on (alpha) over dot/alpha(-0.9+/-2.9)x10(-15) yr(-1) and the fractional time variation of the ratio of Rb and Cs nuclear magnetic moments mu(Rb)/mu(Cs) equal to (-0.5+/-1.7)x10(-15) yr(-1). The latter provides information on the temporal behavior of the constant of strong interaction.