Photoelectron Spectroscopic Study on Decay Processes of Core-Excited States of NaNO2

The absorption and resonant photoelectron spectra of NaNO2 films have been measured at Na-L, N-K, and O-K core levels. The complete understanding of the electronic structures of NaNO2 in a wide energy region is proposed in a band scheme. Resonant photoelectron spectra indicate that the lowest excited states of N-K and O-K excitations (NK-LES and OK-LES) decay predominantly through participator and spectator Auger processes, whereas the normal Auger decay process is negligibly small. The decay probabilities of the NK-LES and OK-LES through the participator Auger process are estimated to be about 47 and 54%, respectively. The delocalization lifetimes of the NK-LES and OK-LES are also estimated to be more than 40 and 28 fs, respectively.