Title :
Frequency comparison of five commercial cesium standards with a NASA experimental hydrogen maser
Author :
Chi, A.R. ; Major, F.G. ; Lavery, J.E.
Abstract :
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.
Keywords :
Atomic measurements; Frequency measurement; Frequency synthesizers; Hydrogen; Laboratories; Magnetic field measurement; Masers; Measurement standards; NASA; Stability;
Journal_Title :
Proceedings of the IEEE
DOI :
10.1109/PROC.1970.7554
