Hyperfine structure and lifetimes of some excited levels inCs+

Hyperfine-structure (hfs) measurements of the 592-nm $5d{\left[\frac{7}{2}\right]}_4^o-6p{\left[\frac{5}{2}\right]}_3$, the 612-nm $5d{\left[\frac{3}{2}\right]}_2^o-6p{\left[\frac{5}{2}\right]}_3$, and the 581-nm $5d{\left[\frac{3}{2}\right]}_2^o-6p{\left[\frac{3}{2}\right]}_1$ transitions in Cs II are performed with the beam-laser technique. The hyperfine coupling constants $A$ and $B$ are evaluated from the experimental data. A comparison with semiempirical calculations of the hfs constants is made. Radiative lifetimes of the levels $6p{\left[\frac{5}{2}\right]}_3$, $6p{\left[\frac{3}{2}\right]}_2$, and $6p{\left[\frac{3}{2}\right]}_1$ are measured with the cascade-free beam-laser technique. The measured lifetimes are compared with lifetimes obtained from semiempirical calculations using the Coulomb approximation.