Electronic States and Band Spectrum Structure in Diatomic Molecules III. Intensity Relations

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Abstract
The correspondence principle predicts definite intensity relations for P, Q and R band lines in molecules having a rotational energy term F(j)=B(j2−σ2)+⋯, provided σ is an electronic quantum number correlated with a precession about the internuclear axis (along which the angular momentum σh2π is directed). Hönl and London have used the summation rule method to obtain exact equations for each of three possible cases Δσ=0, ±1; these equations are recast here in more convenient form. According to recent work of Dennison, these equations very probably remain valid in the new quantum mechanics. Theoretical curves for the cases Δσ=+1 and −1 are given.

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