Trnasition Dipole Moments in Extreme Renner Effect Molecules, with Application to the Visible A1 ↔ B1 Bands in CH2, NH2, and BH2

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Abstract
The theoretical structure of transition dipole moments in extreme Renner effect molecules is considered. Pople and Longuet‐Higgins vibronic wavefunctions, which explicitly correlate nuclear and electronic motion, are employed. Constructive and destructive interference of wavefunctions causes the transition moment to vary, as a function of K and Λ, between the molecular b̂ and ĉ axes. A few unassigned lines in the CH2(1A1 →1B1) spectrum are tentatively identified as type b transitions. It is concluded that in the dihydride radicals CH2, NH2, and BH2, l is decoupled from Λ at the large bending angle where A1 ↔ B1 transitions occur.
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