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Guided by the work of Woerdman and Monyakin, we propose rules that allow the electronic transition dipole moment for a transition in one molecule to be determined from that of a similar one in an isovalent species. The rule can be applied to asymptotically allowed and forbidden transitions. We have tested it by applying it in two specific cases: the moments for the A 1Σ→X 1Σ and X 1Σ→B 1Π transitions in Na2 are found from those in Li2, which are asymptotically allowed and the moments for the B→X transition in O2, Se2, and Te2 which are asymptotically forbidden, are found from moment data for S2. Transition moments calculated with this rule are within 15% of the available literature values and behavior as a function of internuclear separation is well described.

A scaling rule for molecular electronic transition dipole moments: Application to asymptotically allowed and forbidden transitions