Theoretical calculation of energy levels and spectra ab nitio are described forinitio transitions of the type p^m-p^m-1l, especially 3p^m-3p^m-13d transitions in the Ar I and Cl I isoelectronic sequences. Strong changes of wvavefunction composition occur in going from neutral atoms to ions as a result of collapse of the 3d wavefunction; for m = 2 and 6 these take the form of coupling changes, and for m = 3-5 they take the form of changes of parentage composition. Abnormally low Ti v 3p⁶-3p⁵4d intensities are explained as an interference effect in evaluation of the dipole radial integral.

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