Abstract
We have undertaken an extensive large-scale Breit-Pauli configuration interaction calculation of the oscillator strengths for El transitions in ClI between the levels of the odd-parity configurations 3s23p5 3p4(1D)4p, 3p4(3P)np (4 ≤ n ≤ 5) and the even-parity configurations 3s3p6 3p4(3P, 1D, 1S)ns (4 ≤ n ≤ 5), 3p4(3P)6s, 3p4(3P, 1D)3d, 3p4(3P)4d, using the general atomic structure code CIV3. We focus in this short report on relatively weak transitions (oscillator strengths between 0.01 and 0.1), highlighting that the excellent agreement obtained in the length and velocity forms for stronger transitions is maintained, demonstrating a marked improvement over previous theoretical work. Alternative energy level classifications are proposed for a number of heavily mixed J = 5/2 even levels, which are supported by experimental measurements and recent astronomical observations.
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