Absorption Oscillator Strengths for Vibronic Transitions of npπ Rydberg Series in NO

The vibronic intensities for band systems of NO corresponding to transitions with origin in both the X2Π ground and the 3sσ(A2Σ+) Rydberg states, and ending in the npπ Rydberg series with n = 3−5, have been determined. The description of the Rydberg states has been made with the molecular quantum defect orbital methodology. The Rydberg−valence interaction of the 2Π symmetry states involved in the studied transitions has been analyzed through a vibronic matrix. The present results have been compared with experimental and theoretical data available in the literature. Additionally, predictions for a number of unknown intensities have been made, which may be useful for the interpretation of the spectrum of NO.