Anticrossings and microwave transitions between triplet states of D2

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Abstract
Electric field induced anticrossings and X‐band microwave transitions have been observed between the magnetically tuned Zeeman levels of the d (3p) 3Πu, v=3, N=1 and the i (3d) 3Πg, v=3, N=1 levels of para D2. This experiment provides the second, and most precise, interconnection between the two sets of D2 triplets which are not connected by visible spectra. The separation between the above named states is 0.8960±0.0003 cm−1. Values for the spin–orbit coupling constant, the spin–spin coupling constant, and the orbital angular momentum g factor in the 3d 3Πg state have been determined. These values show strong L uncoupling effets and indicate that the D2 i (3d) 3Πg state is intermediate between Hund’s case b and d coupling.