- Photolysis And Scattering, The Interaction Between Slow Electrons And Oxygen Atoms

Configuration interaction (CI) method is used to calculate the excitation energies and oscillator strengths of the ls-2p transition of O IV. Comparison between present results with those obtained by using R-matrix method shows that interaction between K-shell excited states and continuum states as well as the coupling between different ionization channels have definite effects on the excitation energies and oscillator strengths of the K-shell transition of O IV. To obtain a good agreement with experiment, those interactions should be adequately accounted.Extensive research for interaction between atomic oxygen and low energy electron, including elastic scattering and inelastic scattering of the slow electron by atomic oxygen and the near threshold photodetachment of negative atomic oxygen ions, are conducted using the R-matrix method. For the scattering, present result agreed well with experimental result above 3eV, while discrepancy appears below this energy. Analyzing on partial wave cross section shows that the total cross section near the threshold depends greatly on the potential resonance position and width of some partial waves cross section. Calculation on photodetachment of atomic negative oxygen ion shows that electron affinity for the O" (2s22p5 2Po) by considering the excitation of the two electrons from 2s shell agrees with experimental result much better than that only with the excitations of electrons from 2p shell; meanwhile including the configuration interaction due to the 2s electron excitation lead to better agreement between the calculation result and experiment result for atom oxygen 2s22p4(1D, 1S) states, which means that for atomic oxygen, 'S state formed by 2p6 has strong interaction with 2s22p4 !S states. Total photodetachment cross section together with main contribution of the individual ionization channels to the partial cross section are illustrated, which show clearly the threshold structure of atomic negative oxygen ion photodetachment cross section. Comparison is made between present result and former experimental and theoretic result.