Stark-shift measurement of theS1∕22,F=3→F=4hyperfine transition ofCs133

Abstract

In this paper we report the measurement of the frequency Stark shift of the ground-state hyperfine transition of ${}^{133}\mathrm{Cs}$ observed in a vapor cell through a $\Lambda$ excitation scheme. The measured value of the quadratic Stark coefficient is $k=(-2.05\pm 0.04)\times {10}^{-10}\mathrm{Hz}∕{(\mathrm{V}∕\mathrm{m})}^2$ when the electric field is perpendicular to the quantization axis. A comparison with the values previously reported in literature is given in view of its interest for the evaluation of the blackbody radiation shift in the primary frequency standards.