Formulae are given for the intensities of rotational lines in 3Σ–1Σ electronic transitions of linear molecules, allowing for the effects of spin–spin interaction. For [Formula: see text] transitions an error in the relative phases of the two transition moments in the work of Schlapp (1932) is corrected. Recent observations on SO and HCP support this change in phases.
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JAMES K. G. WATSON (1968) studied this question.