The Interpretation of Intensity Distributions in the CN Violet, C₂Swan, OH Violet and O₂Schumann-Runge Band Systems by use of theirr-Centroids and Franck-Condon Factors

Intensity distributions in the CN violet, C 2 Swan, OH violet and O 2 Schumann-Runge band systems are examined to determine in each case the dependence of the electronic transition moment R e ( r ) upon internuclear separation r , with the aid of Franck-Condon factors q ψ'ψ'' and r -centroids r ψ'ψ'' . It is found that R e ( r ) = const (-1 + 2.579 r ) for the CN violet system, that R e ( r ) = const (1 + 0.056 r ) for the C 2 Swan system, that R e ( r ) = const(1 - 0.756 r ) for the OH violet system and that R e ( r ) = const (-1 + 2.416 r - 0.897 r 2 ) for the O 2 Schumann-Runge system. `Smoothed' arrays of relative vibrational transition probabilities have thereby been determined for each band system.