Observation of NO B 2Π(v=3)←X 2Π(v=0) absorptions with 1+1 multiphoton ionization: Precision line position measurements and parity assignment of the B 2Π state

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Abstract
Absorptions are observed in the β(3,0) band of NO, B 2Π(v=3)←X 2Π(v=0) using 1+1 multiphoton ionization at photon energies in the range 47 801–48 542 cm−1. Line positions are reported in 10 of the 12 possible branches with an accuracy of 0.05 cm−1, directly traceable to the visible I2 absorption spectrum. Λ doubling in the β(3,0) band is explicitly resolved, allowing a definitive parity assignment of the B 2Π(v=3) rotational levels. Accurate term energies and molecular constants are presented for B 2Π(v=3). Comparison with previous measurements reveals significant discrepancies. Line positions are also reported in the γ(2,0) band, A 2Σ+(v=2)←X 2Π(v=0), of the 14N18O and 15N16O isotopes.