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A B S T R A C TBy a combination of radiative lifetimes measured using the fast-beam-laser method and experimental branching ratios deduced from Fourier transform spectrometer spectra, it has been possible to derive experimental f-values for Lu ii lines observed in the visible and nearultraviolet regions. These data are compared with relativistic Hartree±Fock calculations, taking core polarization effects into account, and a set of additional oscillator strengths of astrophysical interest is presented.

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Atomic transition rates and f values have been calculated in the triplet and quintet systems and for some intercombination lines of neutral oxygen. Configuration interaction was included in the calculations performed with the CIV3 code of Hibbert (1975) for all the transitions connecting the n=3 and n=4 energy levels. In order to reproduce the observed energy splittings between the energy states, small empirical adjustments were introduced to the diagonal matrix elements. Comparisons with previously published f values and radiative lifetimes are discussed and the subsequent astrophysical applications of the results are briefly mentioned.

Transition probabilities have been calculated with the pseudorelativistic Hartree–Fock (HFR) approach in which core-polarization effects have been included for Δn = 0 and Δn = 1 transitions connecting the 5s25p2, 5s25p6p, 5s25p4f and the 5s5p3, 5s25p5d and 5s25p6s configurations of Xe V. The accuracy of the present set of results is partly assessed through comparisons with the few experimental radiative lifetimes available. The reasons for the discrepancies between theory and experiment are outlined.