Low-energy electron scattering by atomic nitrogen

Abstract

Matrix variational calculations of electron scattering by atomic N have been carried out, including target configurations 2s22p3, 2s2p4, 2p5, and all possible single virtual excitations of 2s and 2p orbitals. Total and differential elastic and inelastic cross sections are reported for energies below the first n=3 excitation threshold. In the lowest energy range, scattering is dominated by a P3 shape resonance whose exact location is sensitive to small differences of electronic correlation energy. Results were obtained for several values of a net correlation energy parameter that produces a systematic shift in the resonance position. Detailed cross sections are given for the value of this parameter in best accord with existing low-energy scattering data. A Po3 shape resonance is found in the Do2→Po2 excitation cross section just below the n=3 threshold. Estimates are given of the rate constants for deactivation of the Do2 and Po2 states by thermal electrons. The locations of the D1 and S1 states of N-, which do not couple to continuum states, are estimated. © 1975 The American Physical Society.