Analyse de la Transition 2Σ(bβJ) → 2Σ(bβS) du Radical LuO

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Abstract
The violet system of LuO is interpreted as a 2Σ(bβJ) → 2Σ(bβS) transition.This assumption accounts for the broadening of the lines of some branches, and the irregularities in the intensity ratios between the G = 3 and 4 components of a line are explained in terms of a bβJ tendency of the ground state.The detailed study of the (0–0) band allowed the accurate calculation of the fundamental state constants, as well as the perturbed constants of the excited state by taking into consideration only the unshifted lines. With the help of a novel computer program, it is shown that the deperturbed constants don't differ appreciably from the perturbed ones. The value of the perturbation matrix element and of the rotational constant of the perturbing state are obtained. The nature of the latter is not determined with certainty; however, it seems that most probably a 2Σ–2Π1/2 type interaction is involved. The intensity differences between the lines of the R and P branches corresponding to the same excited sublevel may be explained on the basis of this hypothesis.

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