Abstract
The system of observed energy levels of CsII of Wheatley and Sawyer has been reinterpreted through the use of Hartree-Fock calculations and published Zeeman effect and hyperfine-structure measurements. Of the 80 known levels, 30 have been rejected as being not real. A revised list of 54 observed levels of CsII is presented that includes the $5{p}^{5}5d^{1}P_{1}$ level recently found by Reader and Epstein and three levels of the $5{p}^{5}6d$ configuration that were located with the aid of Sommer's line list. Percentage compositions and Slater parameters are given for the $5{p}^{5}(5d+6s)$, $6p$, and ($6d+7s$) configurations, Severe configuration mixing is found for levels of the $5{p}^{5}(5d+6s)$ group. The measured $g$ values of the $5{p}^{5}(5d+6s)$ levels provide evidence of a strong term dependence for the parameter ${G}^{1}(5p5d)$. By taking into account displacements of the $5{p}^{5}\mathrm{ns}$ levels due to configuration interaction, the ionization energy is revised to be 186 600 \ifmmode\pm\else\textpm\fi{} 150 ${\mathrm{cm}}^{\ensuremath{-}1}$ (23.14 \ifmmode\pm\else\textpm\fi{} 0.02 eV).
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