title: Distorted wave Born and three-body distorted wave Born approximation calculations of the fully differential cross section for electron-impact ionization of nitrogen molecules.
abstract: Currently there are no reliable theoretical approaches for calculating fully differential cross sections (FDCSs) for low-energy electron-impact ionization of large molecules. We have recently proposed the orientation-averaged molecular orbital (OAMO) for calculating cross sections averaged over molecular orientations. In this paper, we use the OAMO to calculate distorted wave Born approximation (DWBA) and molecular three-body distorted wave (M3DW) Born approximation FDCS for electron-impact ionization of the nitrogen molecule. Both coplanar symmetric and asymmetric FDCSs are investigated in the energy range of 35.6-400 eV. By comparing with the experimental data, we found that the M3DW is reasonably accurate in this energy range. We also found that the postcollision interaction plays a sufficiently important role and that the DWBA is not reliable.
authors.affiliation: Department of Physics, University of Missouri-Rolla, Rolla, MO 65409-0460, USA. jgzm6@umr.edu
authors.forename: Junfang
authors.initials: J
authors.lastname: Gao
authors.forename: D H
authors.initials: DH
authors.lastname: Madison
authors.forename: J L
authors.initials: JL
authors.lastname: Peacher