TY - JOUR

T1 - Nitrogen and oxygen core excitations in solid NaNO2 studied by X-ray absorption and resonant photoemission

AU - Vinogradov, A. S.

AU - Preobrajenski, A. B.

AU - Molodtsov, S. L.

AU - Krasnikov, S. A.

AU - Szargan, R.

AU - Knop-Gericke, A.

AU - Hävecker, M.

PY - 1999/11/1

Y1 - 1999/11/1

N2 - The origin and properties of the nitrogen and oxygen K excitations in solid NaNO2 were investigated combining high-resolution X-ray absorption and resonant photoemission spectroscopy. The absorption spectra obtained were treated on the basis of comparison between the spectra of solid NaNO2 and gas-phase NO2 and CH3NO2 molecules, as a result of which main absorption bands were assumed to be associated with the core electron transitions to unoccupied π and σ molecular orbitals of the planar NO2Na quasimolecule - the structural unit of the crystal. Examining series of the photoemission spectra taken at the N K and O K edges, it was found that the π and σ excitations decay in different ways: three decay channels (spectator, participator and normal Auger processes) were observed for the π excitations whereas only the normal and spectator Auger decay channels were seen for the σ excitations. This fact was qualitatively explained in terms of differences in the spatial localization and lifetime of the corresponding core excitations. The results of the resonant photoemission study give a direct evidence for the quasimolecular NO2- origin of the lowest unoccupied electronic states of the π type in solid NaNO2.

AB - The origin and properties of the nitrogen and oxygen K excitations in solid NaNO2 were investigated combining high-resolution X-ray absorption and resonant photoemission spectroscopy. The absorption spectra obtained were treated on the basis of comparison between the spectra of solid NaNO2 and gas-phase NO2 and CH3NO2 molecules, as a result of which main absorption bands were assumed to be associated with the core electron transitions to unoccupied π and σ molecular orbitals of the planar NO2Na quasimolecule - the structural unit of the crystal. Examining series of the photoemission spectra taken at the N K and O K edges, it was found that the π and σ excitations decay in different ways: three decay channels (spectator, participator and normal Auger processes) were observed for the π excitations whereas only the normal and spectator Auger decay channels were seen for the σ excitations. This fact was qualitatively explained in terms of differences in the spatial localization and lifetime of the corresponding core excitations. The results of the resonant photoemission study give a direct evidence for the quasimolecular NO2- origin of the lowest unoccupied electronic states of the π type in solid NaNO2.

UR - http://www.scopus.com/inward/record.url?scp=0033260364&partnerID=8YFLogxK

U2 - 10.1016/S0301-0104(99)00287-6

DO - 10.1016/S0301-0104(99)00287-6

M3 - Article

AN - SCOPUS:0033260364

VL - 249

SP - 249

EP - 258

JO - Chemical Physics

JF - Chemical Physics

SN - 0301-0104

IS - 2-3

ER -