Cancellation of the collisional frequency shift in caesium fountain clocks

Details Cancellation of the collisional frequency shift in caesium fountain clocks Cancellation of the collisional frequency shift in caesium fountain clocks

2006-12-12

arxiv.org/abs/physics/0612110v1

Physics

Atomic Physics

Scientific paper

10.1117/12.732017

We have observed that the collisional frequency shift in primary caesium fountain clocks varies with the clock state population composition and, in particular, is zero for a given fraction of the |F = 4, mF = 0> atoms, depending on the initial cloud parameters. We present a theoretical model explaining our observations. The possibility of the collisional shift cancellation implies an improvement in the performance of caesium fountain standards and a simplification in their operation. Our results also have implications for test operation of fountains at multiple pi/2 pulse areas.

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