The oscillator strength of the 6s6p1P1–6s5d1D2 transition in barium has been inferred from the efficiency of laser deflection of an atomic beam. The result, f ≤ 0.0034, is a large correction to the previously accepted experimental value of f = 0.1, although it agrees reasonably well with recent theoretical work.
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Bernhardt et al. (1976) studied this question.