Radiative lifetimes of Cr ii levels

Radiative lifetimes for 17 levels of the ${\mathit{z}}^4$P°, ${}_{}{}^6{}_{}{}^{}\mathrm{°}$, ${\mathit{z}}^6$F°, and ${\mathit{z}}^6$P° terms in Cr i have been measured by the technique of time-resolved laser-induced fluorescence from sputtered metal vapor, extracted from a pulsed hollow cathode discharge. A XeCl-excimer laser-pumped distributed-feedback dye-laser with a pulse duration of 200 ps, a spectral bandwidth of 0.006 nm, and a repetition rate of up to 200 Hz was employed for the selective excitation of the levels investigated.