New measurement of the relativistic Doppler shift in neon

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Abstract
We report on a a new measurement of the relativistic Doppler shift in neon. We measured the frequency difference between a two-photon transition in a fast beam and a slow beam. The result is compared to the prediction of special relativity. The experiment represents a more than tenfold improvement over other Doppler shift measurements and verifies the time dilation effect at an accuracy level of 2.3 ppm.

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