π Emission Anomaly in the N 1s Resonance Emission from Hexagonal BN: Effects of the Core Hole Potential

Abstract

N 1s resonance emission spectra in hexagonal BN was measured with high energy resolution at an undulator beamline. It was found that π emission is very weak in the spectator emission, while both π and σ components are present in the normal emission. This π emission anomaly has been explained in terms of the Coulombic effect of the core hole on the localized N 2p_z valence orbital. The π emission anomaly is quite analogous to the case of the B 1s resonance emission observed in the previous study.