Observation of Rydberg (CΠ2)-valence (BΠ2) Interactions in NO by Multiphoton Photoelectron Spectroscopy

Abstract
Photoelectron spectra for the three-photon resonant, five-photon ionization of NO via the v=0 level of the CΠ2(3pπ) Rydberg state show that NO+ (XΣ+1) is formed primarily in v=0 and v>~3. The relative populations of the v=0 to v>~3 levels are strongly dependent on the excited rotational level of the C state. These data are consistent with known perturbations between the nearly degenerate CΠ2, v=0 Rydberg and BΠ2, v=7 valence levels.