Abstract
The rovibronic term values, Landé factors, and radiative properties of all bound levels in the 3s,d 3Λg+ complex of H2, D2, and HD are evaluated in the framework of fully ab initio channel-coupling approach. The modified multichannel quantum-defect theory is employed to transform highly accurate ab initio Born–Oppenheimer electronic matrix elements borrowed from a literature to their diabatic counterparts avoiding explicit consideration of radial coupling effects. The radiative lifetimes of the most critical levels in the H2 complex are remeasured by a delayed coincidence method. The accuracy of the predicted term values, Landé factors, transition probabilities and experimental lifetimes is sufficient to indicate the sources of disagreement in existing theory and experimental data.
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