Abstract
Rydberg series of NO in the 600–1000-Åregion were investigated by using a 6.65-m high-dispersion vacuum spectrograph. The previous β, γ (v = 0), and γ (v = 1) Rydberg series were extended up to n = 31, 31, and 28, respectively. From the analysis of these Rydberg series, accurate ionization energies were obtained: 133 565 ± 3 (16.5596 eV) for b3Π (v = 0); 147 811 ± 3 (18.3258 eV) for A1Π (v = 0); 149 372 ± 3 cm−1 (18.5193 eV) for A1Π (v = 1) of NO+. A new Rydberg series converging to one of the triplet components in b3Π was identified, and the coupling constant of b3Π was estimated to be 35 ± 8 cm−1. Higher members of two Rydberg series were newly observed in the 700–725-Åregion. From their series limits, 139 926 ± 3 and 141 160 ± 3 cm−1, they were assigned to be the Rydberg series converging to the v = 3 and 4 levels of ω 3Δ in NO+.
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