Radiative lifetimes of Cd Ⅰ and Cd Ⅱ excited states

摘要

Radiative lifetimes of 11 levels in Cd Ⅰ belonging to the 5s5p ~1p~0_1 and 5snd ~3D_(1,2) (n=6-9) and 5sns ~3S_1 (n=7, 8) series, and of 5 levels of Cd Ⅱ belonging to the 4d~(10)5p ~2P~0_(1/2,3/2), 4d~(10)6s~2S_(1/2), and 4d~(10)5d ~2D_(3/2,5/2) configurations were measured using the time-resolved laser-induced fluorescence technique. Free neutral and singly ionised cadmium were generated by laser ablation. Single- or two-step excitation processes were used to populate the levels under study. Transition probabilities and oscillator strengths for Cd Ⅰ and Cd Ⅱ transitions were also deduced by combining the experimental lifetimes and theoretical branching fractions obtained in multiconfigurational relativistic Hartree-Fock calculations, taking core-polarisation effects into account.