Determination of the hyperfine coupling constant of cesium 7S1/2 state

TL;DR

This paper precisely measures the hyperfine splitting of cesium's 7S1/2 state using optical spectroscopy, leading to an accurate determination of its hyperfine coupling constant, improving upon previous measurements.

Contribution

The study provides a more accurate value of the hyperfine coupling constant for cesium 7S1/2 state using advanced optical measurement techniques.

Findings

Hyperfine splitting measured as 2183.273(37) MHz.

Hyperfine coupling constant determined as 545.818(09) MHz.

Results agree with previous work but with higher precision.

Abstract

We report the hyperfine splitting (HFS) measurement of cesium (Cs) 7S1/2 state by optical-optical double-resonance spectroscopy in the 6S1/2-6P3/2-7S1/2 (852 nm + 1470 nm) ladder-type system. The HFS frequency calibration is performed by employing a phase-type waveguide electro-optic modulator together with a stable confocal Fabry-Perot cavity. From the measured HFS between F"= 3 and F"= 4 manifolds of Cs 7S1/2 state [HFS = 2183.273(37) MHz], we have determined the magnetic dipole hyperfine coupling constant [A = 545.818(09) MHz], which is in good agreement with the previous work but much more accurate.