Measurement Of The Hyperfine Interaction Constant Of The Cesium 7S_1/2 State

High-precision measurement of the hyperfine interaction constant of the cesium?Cs?7S_1/2 state is presented in this thesis.The levels of interest,Cs 7S_1/2?F'' = 3 and 4?are accessible with electric-dipole transitions by the 6S_1/2-6P3/2-7S_1/2?852 nm + 1470 nm?ladder-type channel from the atomic ground state 6S_1/2,using the optical-optical double-resonance spectroscopy.The hyperfine splitting frequency calibration is performed by employing a phase-type waveguide electro-optic modulator and a stable confocal Fabry-Perot cavity.From the measured HFS between the?F'' = 3?and?F'' = 4?manifolds of the Cs 7S_1/2 state?HFS = 2183.273 ± 0.062 MHz?,we have determined the magnetic dipole hyperfine interaction constant?A = 545.818 ± 0.016 MHz?,which is in good agreement with the previous work but much more precise.The hyperfine splitting of the Cs 7S_1/2 state can provide information about the distribution of the nuclear charge and nuclear spin,as well as the behavior of the electronic wave functions at the nucleus position,these are important for interpretation of some fundamental physics,especially the parity nonconservation results.The high-precision measurement of hyperfine interaction constant of the Cs 7S_1/2 state can also test the models especially about Cs atomic structure calculations.