Szymaniec, K; Lea, S N; Liu, K* (2014) An evaluation of the frequency shift caused by collisions with background gas in the primary frequency standard NPL-CsF2. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 61 (1). pp. 203-206.

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Abstract

Collisions between cold caesium 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 caesium fountain primary frequency standard based on measure¬ments of the fractional loss of cold atoms from the atomic cloud during the interro¬gation time combined with a model [K. Gibble, Phys. Rev. Lett., 110, 180802, 2013] that quantifies the relationship between the loss and the frequency shift.

Item Type:	Article
Subjects:	Time and Frequency Time and Frequency > Microwave Frequency Standards
Identification number/DOI:	10.1109/TUFFC.2014.2892
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/6060

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