The configuration interaction code CIV3 is used to calculate the A-value for the 1909 Å 2s2 1S0-2s2p 3Po1 intercombination line in C III. An extensive calculation of valence shell correlation is augmented by the inclusion of core polarization effects both explicitly through further configurations with one or both 1s orbitals replaced by correlation orbitals, and also by the use of model potentials. Our recommended value of 104 ± 4s−1 for the A-value lies somewhat lower than the experimentally determined value of 121 ± 7s−1. We have estimated the expected error in our work by considering the extent of the convergence of our calculation. We also calculated the resonance transition and obtain an oscillator strength in excellent agreement with experiment.
Transition probabilities based on sophisticated configuration interaction wave funetions have been obtained for transitions between the fine structure levels of the 26 lowest lying 2s22p3, 2SZp4, 2s22p23s, 2s22p23p, 2s22p23d states of singly ionized oxygen. The calculations were performed ,using the CIV3 code of Hibbert [I] and small empirical adjustments were introduced to the diagonal Hamiltonian matrix elements in order to achieve accurate energy splittings between the levels. The present results are believed to be the most accurate available and, for several allowed transitions, a significant departure from LS coupling, due to relativistic effects, is found.
Sophisticated configuration interaction wave functions have been used to obtain transition probabilities for transitions between the fine structure levels of the thirty-two lowest lying 2s22p2, 2s2p3,. 2s22p3s, 2s22p3p, 2s22p3d, 2s22p4s, 2s22p4p states together with the 2s2p23s state of singly ionised nitrogen. The calculations were performed using the CIV3 code and small empirical adjustments were introduced to the diagonal Hamiltonian matrix elements in order to achieve accurate energy splittings between the levels and thereby the CI mixing coefficients. The present results are believed to be the most accurate available. Significant differences are found when the present lifetimes of the more highly excited states are compared with recent experimental data.
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