Fine- and hyperfine-structure investigation in the5D2−nF2series of cesium

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Abstract
The authors have studied the fine-structure splittings in the F sequence of states in the cesium atom using high-resolution laser spectroscopy. The experiments were performed with a single-mode laser acting on the transitions from the lowest D state to the different F doublets. The Doppler broadening was reduced to about 20 MHz by means of the techniques of collimated atomic beams. For populating the D state, a further laser acting on the transition from the ground state to the second excited P state was used. About 10% of the P-state atoms decay to the 5D2 levels. All the studied F states were found to be inverted, with splittings as follows: ΔE(10F2)=−873.2(2.0) MHz, ΔE(11F2)=−667.2(2.0) MHz, ΔE(12F2)=−522.0(3.0) MHz, ΔE(13F2)=−416.0(3.0) MHz, ΔE(14F2)=−336.8(1.0) MHz, ΔE(15F2)=−276.3(1.0) MHz, ΔE(16F2)=−229.3(1.0) MHz, and ΔE(17F2)=−190.5(2.0) MHz. The results are compared with recent theoretical calculations. A further result of the present investigation is the hyperfine structure of the 5D32,522 states of Cs133. For the magnetic dipole interaction constant a and the electric quadrupole interaction constant b the following values were obtained: a(5D322)=+48.6(2) MHz, b(5D322)=0.0(8) MHz, a(5D522)=−21.2(1) MHz, b(5D522)=0.0(1.0) MHz. The inversion of the 5D522 state is especially noteworthy, but can be explained as due mainly to strong polarization effects.