Measurement of the133Cs 6p2P1/2state hyperfine structure

We employ crossed-beam laser spectroscopy to measure the hyperfine structure of the $6p{}^2{P}_{1/2}$ state of atomic ${}^{133}\mathrm{Cs}$ $(I=$ $\frac{7}{2}$ $).\mathrm{}$ A frequency-stabilized Ti:sapphire laser with 1-GHz sidebands excites a thermal atomic cesium beam through the $6s{}^2{S}_{1/2}$ $F=3,$ $4\to 6p{}^2{P}_{1/2}$ $F^{\prime }=3,4\mathrm{}$ resonance transitions at 895 nm. The hyperfine splitting of the excited state is determined from the observed fluorescence spectra. Our result for the $6p{}^2{P}_{1/2}$ $F^{\prime }=3\mathrm{}$ to $F^{\prime }=4\mathrm{}$ hyperfine splitting is 1167.54(32) MHz, yielding a magnetic dipole coefficient of $A=291.89\mathrm{}\left(8\right)\mathrm{}$ MHz. In this Brief Report we also compare our results with previous measurements and theory.