Abstract
Using Doppler-free two-photon spectroscopy of the 2S1/2-nD5/2(n=8, 10, 12) transitions in atomic hydrogen, we obtained in 1988[1] a determination of the Rydberg constant with an uncertainty of 1.7 parts in 1010. In this measurement, the wavelength of the transitions studied was measured by an interferometric comparison with that of an optical standard, an iodine-stabilized He-Ne laser at 633 nm. In the near future, this precision could be improved by one order of magnitude for two reasons: firstly, the frequency of the He-Ne standard, then known with a precision of only 1.6 parts in 1010, is currently being remeasured at the L.P.T.F. (Paris) by A. Clairon and his collaborators; secondly, we have now replaced our wavelength calibration-limited to a few parts in 1011–by a direct frequency comparison of the 2S-8S/8D lines with two optical standards.
© 1992 IQEC
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