Frequency shift of cesium clock transition due to blackbody radiation

Abstract

We have performed ab initio calculations of the frequency shift induced by a static electric field on the cesium clock hyperfine transition. The calculations are used to find the frequency shifts due to blackbody radiation. Our result ($\delta \nu /E^2=-2.26(2)\times 10^{-10}$Hz/(V/m)${}^2$) is in good agreement with early measurements and ab initio calculations performed in other groups. We present arguments against recent claims that the actual value of the effect might be smaller. The difference ($\sim$ 10%) between ab initio and semiempirical calculations is due to the contribution of the continuum spectrum to the sum over intermediate states.

Accepted for publication in Phys. Rev. Lett

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• Off-Diagonal Hyperfine Interaction and Parity Non-conservation in Cesium
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