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This work reports new experimental radiative lifetimes and calculatedoscillator strengths for transitions from 3d8 4d levels of astrophysicalinterest in singly ionized nickel. Radiative lifetimes of seven high-lyinglevels of even parity in Ni II (98400 -100600 cm-1) have been measured usingthe time-resolved laser-induced fluorescence method. Two-step photon excitationof ions produced by laser ablation has been utilized to populate the levels.Theoretical calculations of the radiative lifetimes of the measured levels andtransition probabilities from these levels are reported. The calculations havebeen performed using a pseudo-relativistic Hartree-Fock method, taking intoaccount core polarization effects. A new set of transition probabilities andoscillator strengths has been deduced for 477 Ni II transitions ofastrophysical interest in the spectral range 194 - 520 nm depopulating evenparity 3d8 4d levels. The new calculated gf-values are, on the average, about20 % higher than a previous calculation by Kurucz (http://kurucz.harvard.edu)and yield lifetimes within 5 % of the experimental values.

Radiative data for highly excited 3d8 4d levels in Ni II from laboratory measurements and atomic calculations