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Frequency comparison of five commercial cesium standards with a NASA experimental hydrogen maser

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3 Author(s)

Recent long-term phase comparisons between five commercial cesium beam frequency standards and a NASA experimental hydrogen maser, NX-1, have yielded a value for the frequency of the hydrogen maser of 1 420 405 751.7767±0.0024 hertz which is 6.77×10-12±1.66 lower than that given by Vessot et al. in 1966.

Published in:

Proceedings of the IEEE  (Volume:58 ,  Issue: 1 )