THEORETICAL WAVELENGTHS AND TRANSITION PROBABILITIES FOR THE 3d9–3d84p AND 3d84s–3d84p TRANSITION ARRAYS IN Ni II

Rates of E1, E2, M1, and M2 transitions in Ni II

“…There is quite good agreement between length and velocity forms for many of the transitions, for both our Calculations. That is also true of the results of Fritzsche et al (2000), although in other transitions their length/velocity agreement is not as good as is ours. Our results are in somewhat better agreement with Fritzsche et al (2000) than with the HFR results of Kurucz (2000).…”

“…In Table 2, we present results for a number of transitions for both Calculations and compare the results with those of two other theoretical methods: the Cowan code results of Kurucz (2000) (also used by Ferrero et al 1997) and the REOS calculation of Fritzsche et al (2000) based on extensive MCDF wavefunctions, for the more limited range of transitions between 3d 9 , 3d 8 4s, and 3d 8 4p. These two compilations, along with our own, have employed contrasting methodologies in the calculation of Ni II atomic transition data, and such a comparison is useful in assessing the accuracy of the results.…”

“…These two compilations, along with our own, have employed contrasting methodologies in the calculation of Ni II atomic transition data, and such a comparison is useful in assessing the accuracy of the results. Fritzsche et al (2000) have computed transition probabilities using both ab initio theoretical and experimental wavelengths. However, we were unable to see how for some of the transitions the "experimental" results were arrived at from the use of experimental rather than theoretical energies alone.…”

“…When compared with previously evaluated theoretical and experimental data, an accuracy of better than 25% for most strong lines was estimated; larger uncertainties are expected for weaker transitions. The oscillator strengths as derived from the transition probabilities of Fritzsche et al (2000) were later compared to the experimental determinations of Jenkins & Tripp (2006). The theoretical f -value for the resonance transition at λ1317 Å was found to lie 18% higher than the experimental value.…”

“…These discrepancies perhaps highlight the inaccuracy of the former theoretical computation. Fritzsche et al (2000) have computed wavelengths and transition probabilities for all E1 transitions among the 3d 9 −3d 8 4p and 3d 8 4s−3d 8 4p multiplets of Ni II, establishing a dataset comprising 450 emission lines. Multi-configuration Dirac-Fock (MCDF) wavefunctions were generated using GRASP2 (Grant et al 1980) and the associated transition probabilities and lifetimes calculated using the relaxed-orbital REOS program (Fritzsche & Froese Fischer 1997).…”