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The occurrence of an infra-red edge to the red band system of Na₂ is reported and is explained in terms of the Franck-Condon theory of intensity distribution when account is taken of the shape of the potential energy curves as dissociation is approached. The same theory explains a head of the red system in the yellow-green, the reappearance of the orange "cathode-ray fluorescence" series in the infra-red, and the observed asymmetry in the two branches of the Condon "parabola."
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Loomis et al. (1928) studied this question.
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