Computed oscillator strengths and energy levels for Fe III, Fe IV, Fe V, and Fe VI with calculated wavelengths and wavelengths derived from established data

Abstract

Calculated weighted oscillator strengths are tabulated for spectral lines of Fe III, Fe IV, Fe V, and Fe VI. The lines belong to transition arrays 3 d 6-3 d 54 p and 3 d 54 s-3 d 54 p in Fe III, 3 d 5-3 d 44 p and 3 d 44 s-3 d 44 p in Fe IV, 3 d 4-3 d 34 p and 3 d 34 s-3 d 34 p in Fe V, and 3 d 3-3 d 24 p and 3 d 24 s-3 d 24 p in Fe VI. For the calculations, Slater parameters are optimized on the basis of minimizing the discrepancies between observed and computed wavelengths. Configuration interaction was included among the 3 d n , 3 d n−1 4 s, 3 d n−2 4 s 2, 3 d n−1 4 d, and 3 d n−1 5 s even configurations and among the 3 d n−1 4 p, 3 d n−2 4 s4 p, and 3 d n−1 5 p odd configurations, with 3 p 53 d n+1 added for Fe VI. Calculated wavelengths are compared with observational data, and the compositions of energy levels are listed. This completes a series of similar computations for these complex configurations covering Fe I to Fe VI.