New Investigation Of The Electron-Impact Ionization Of The Intermediate Valence State Of Ammonia

We report on the measurement of the triply differential cross-section for electron-impact ionization of the valence 1e orbitals of ammonia using the (e, 2e) technique with coplanar asymmetric kinematics. The experimental results are first compared to the theoretical cross sections calculated using the 1CW, 1DW and the BBK models recently extended to molecules. We then introduce the short-range (SR) potential of interaction between the incident electron and the target into these models. The experimental data are thus compared to the newly developed extended models 1CWSR, 1DWSR and BBKSR. We show that the introduction of the SR potential improves the visibility of the recoil region.