Cancellation of the Collisional Frequency Shift in Caesium Fountain Clocks
K Szymaniec, W Chalupczak, Eite Tiesinga, Carl J. Williams, S Weyers, R. Wynands
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.
Physical Review Letters
atomic clocks, ceasium, ultracold collisions
, Chalupczak, W.
, Tiesinga, E.
, Williams, C.
, Weyers, S.
and Wynands, R.
Cancellation of the Collisional Frequency Shift in Caesium Fountain Clocks, Physical Review Letters
(Accessed October 23, 2021)