Abstract. Oscillator strengths for 3s2 3p 2 → 3s 2 3p 1 3d 1 and 3s 2 3p 2 → 3s 2 3p 1 4s 1 transitions in the silicon sequence (KVI -XeXLI) have been calculated using the Relativistic Quantum Defect Orbital (RQDO) method, with and without explicit inclusion of core-valence correlation, and the multiconfigurational Dirac-Fock (MCDF) approach. Our f -values, which are of interest in astrophysics and fusion plasma research, are compared with other theoretical results in the cases for which these are available.

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Absorption oscillator strengths for the γ(A2Σ+−X2Π), δ(C2Π−X2Π), and ε(D2Σ+−X2Π) bands of NO, which are relevant to the study of atmospheric processes are reported. We have calculated both electronic and vibronic transition probabilities with the molecular-adapted quantum defect orbital (MQDO) method, which has proved, in previous applications, to be an adequate theoretical tool in the context of Rydberg spectra. The results appear to be in good accord with the available experimental values and, with some exceptions, conform fairly well with theoretical data derived from rather more sophisticated methods.

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