Anticrossings and microwave transitions between the k (4p) 3Πu, v = 1, N = 3 and the p (4d) 3Σ+g, v = 1, N = 5 levels of H2

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Abstract
Electric field induced anticrossings and electric dipole microwave transitions have been observed between the k (4p) 3Πu, v = 1, N = 3 and the p (4d) 3Σ+g, v = 1, N = 5 levels of H2. These ΔN = 2 anticrossings are forbidden except for mixing with N = 4 levels by the magnetic field. Our observations show that at zero field the 3Πu N = 3 level lies 0.2785±0.0001 cm−1 above the 3Σ+g N = 5 level, a separation significantly smaller than the optical value of 0.38 cm−1. Fine structure parameters for the k (4p) 3Πu state are consistent with values determined by MOMRIE from the N = 1 level. The magnetic g value and fine structure parameters for the p (4d) 3Σ+g state show that it lies very close to Hund’s case d.