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Report on the precision of atomic standards of frequency

Published online by Cambridge University Press:  14 August 2015

L. Essen*
Affiliation:
National Physical Laboratory, Teddington, England

Abstract

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Atomic frequency standards have been checked by laboratory investigations and by the intercomparison of different standards.

Existing ammonia Masers enable a frequency to be defined in terms of a spectral line with an accuracy of ±1 part in 108 and give a reproducibility under stated conditions of ±2 parts in 1010. The cesium atomic beam standard enables a frequency to be defined in terms of a spectral line with a precision of ±1 part in 1010. Comparison between the U.K. and U.S. by the radio transmissions of standard frequencies and time signals gave an average agreement of a few parts in 1010 but revealed some systematic discrepancies. Direct comparisons between three U.S. standards and the U.K. standard gave agreement to 2.2, 3.2, and 1.5 parts in 1010.

Type
Part III. Atomic Standards of Frequency
Copyright
Copyright © American Astronomical Society 1959