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Berlin 2001 – scientific programme

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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.27: Poster

Friday, April 6, 2001, 12:30–15:00, AT3

Preparatory measurements for a new test of the time dilation factor — •Guido Saathoff1, Gerald Gwinner1, Gerhard Huber2, Sergej Karpuk2, Dirk Schwalm1, Matthias Weidemüller1, and Andreas Wolf11Max-Planck-Institut für Kernphysik, D-69117 Heidelberg — 2Institut für Physik, Universität Mainz, D-55099 Mainz

The comparison of the transition frequency of an ion at two different velocities measured by collinear laser spectroscopy of an ion beam provides a test of the relativistic Doppler formula and, therefore, the time dilation factor γ. Possible deviations from γSR predicted by the theory of special relativity are parametrized, e.g. in the test theory by Mansouri and Sexl [2], through γ = γSR(1+α β2+...). Previous measurements at the TSR storage ring in Heidelberg used a beam of metastable 7Li+ ions at β =0.065 . The achieved total accuracy of 3 MHz (Δν/ν=9× 10−9), together with the ions rest-frame frequency [3], resulted in an upper limit for α of 8× 10−7 [1]. Experimental investigations are presently being performed to further minimize systematic errors in preparation of a new improved 7Li+ experiment at the TSR. Here the transition frequency is planned to be measured at two finite, but sufficiently distinct velocities β = 0.065 and β = 0.029, respectively, with an accuracy well below 1 MHz.
[1] R. Grieser et al., Appl. Phys. B59, 127 (1994).
[2] R. Mansouri, R. U. Sexl, Gen. Rel. Grav. 8(7), 497 (1977).
[3] E. Riis et al., Phys. Rev A 33, 3023 (1986).

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