An evaluation of the frequency shift caused by collisions with background gas in the primary frequency standard NPL-CsF2

Collisions between cold cesium atoms and background gas atoms at ambient temperature reduce the cold atom signal in a fountain clock and at the same time produce a shift in the measured clock frequency. We evaluate the shift in the NPL-CsF2 cesium fountain primary frequency standard based on measure...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2014-01, Vol.61 (1), p.203-206
Main Authors: Szymaniec, Krzysztof, Lea, Stephen, Kun Liu
Format: Article
Language:English
Subjects:
Atomic clocks
Atomic measurements
Cesium - chemistry
Cesium - standards
Equipment Design
Equipment Failure Analysis
Fluorides - chemistry
Fluorides - standards
Frequency control
Frequency measurement
Gases - chemistry
Loss measurement
Oscillometry - instrumentation
Oscillometry - standards
Time Factors
United States
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Summary:Collisions between cold cesium atoms and background gas atoms at ambient temperature reduce the cold atom signal in a fountain clock and at the same time produce a shift in the measured clock frequency. We evaluate the shift in the NPL-CsF2 cesium fountain primary frequency standard based on measurements of the fractional loss of cold atoms from the atomic cloud during the interrogation time combined with a model by Gibble that quantifies the relationship between the loss and the frequency shift.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2014.6689789