High-resolution and symmetry-resolved N and O K-edge absorption spectra of NO

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Abstract
High‐resolution electron‐yield and ‘‘symmetry‐resolved’’ ion‐yield spectra have been measured at the N and O K edges of a 2Π open‐shell molecule, NO. Several Rydberg transitions converging to the 3Π and 1Π ionization thresholds are found. The core‐to‐valence and core‐to‐Rydberg transitions are interpreted with the help of ab initio self‐consistent‐field configuration‐interaction and frozen‐core calculations for the core‐excited states with three open shells. It is found that the equivalent‐core model (N*O=O2) breaks down in discussing the state ordering of the three N 1s–2pπ* excited states, 2Δ, 2Σ−, and 2Σ+. It is important to consider explicitly the core hole and the exchange repulsion between the core and π* electrons.