Ionisation differential cross section measurements for N2 at low incident energy in coplanar and non-coplanar geometries
Ahmad Sakaamini1, Sadek Amami2, Andrew James Murray1, Chuangang Ning3 and Don Madison2
1 Photon Science Institute, School of Physics & Astronomy, University of Manchester, Manchester M13 9PL, UK
2 Missouri University of Science & Technology, Rolla. MO 65409-0640, USA
3 Department of Physics, State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, People’s Republic of China
E-mail: Andrew.Murray@manchester.ac.uk and Madison@mst.edu
Published 15 September 2016 • © 2016 IOP Publishing Ltd
Abstract. Ionisation triple differential cross sections have been determined experimentally and theoretically for the neutral molecule N2 over a range of geometries from coplanar to the perpendicular plane. Data were obtained at incident electron energies ∼10 and ∼20 eV above the ionisation potential of the 3σg, 1πu and 2σg states, using both equal and non-equal outgoing electron energies. The data were taken with the incident electron beam in the scattering plane (ψ=0°), at 45° to this plane and orthogonal to the plane (ψ=90°). The set of nine measured differential cross sections at a given energy were then inter-normalised to each other. The data are compared to new calculations using various distorted wave methods, and differences between theory and experiment are discussed.