The formulas for the rotational excitation of diatomic molecules in the adiabatic theory are generalized to include rotational excitation within molecular states of arbitrary Λ symmetry. For Λ not equal to zero (non-Σ states), the rotational quantum number can change by any integer, and not only an even integer as is the case for Σ states.
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Temkin et al. (1971) studied this question.
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