Precision measurement of the hyperfine structure of the ¹³³Cs 6P _3/2 state

We report measurements of the hyperfine structure of the 6P_3/2 state of atomic ¹³³Cs(I = 7/2). A frequency-stabilized laser diode is used to perform crossed-beam laser spectroscopy of the Cs 6S_1/2(F = 3,4)) 6P_3/2 (F′) transitions. From the measured hyperfine splittings, we determine the coefficients of the magnetic dipole (A) and electric quadrupole (B) contributions to the hyperfine structure. Our results are A = 50.273(3) MHz and B = −0.53(2) MHz.