Angular distribution for the major photoelectron bands of nitrogen below 45 eV binding energy

Abstract

Measurements on the angular-distribution parameter, β, for photoionization from the 3σ g, l π u and 2σ u orbitals of nitrogen have been extended to a photon energy of 70 eV. At the higher photon energies the agreement between theory and experiment is improved over that obtained at lower photon energies. The angular-distribution parameter for photoionization from the 2σ g orbital (≈ 38 eV) and the main satellite band at 29 eV are reported for the first time. The angular-distribution parameter, as measured over the 38 eV band, is consistent with two or more transitions to ▪ states which obtain their intensity from a (2σ g) −1 hole configuration. Results for the 2σ g inner valence band at 38 eV are also consistent with one-electron continuum multiple-scattering Xα calculations. The major features of the inner valence region (20–45 eV) may be explainable using an excited-state molecular-orbital picture coupled to the outer most valence orbitals.