Electron Impact Ionization Cross Sections of Tungsten Atoms and Tungsten Ions

抄録

Tungsten (W) and tungsten based materials have been recommended as the plasma facing component in the current fusion devices. The electron induced processes on these materials are of prime importance for the application purposes. Electron impact total ionization cross sections (TICS) are reported for the W atoms and W⁺ ions. The TICSs have been calculated in the variants of distorted wave approximation (DWA) using Hartree-Fock wave functions and distorted potential with semi-classical exchange. Present TICS results have been compared with the available theoretical and experimental results. Reasonable agreement with the existing theoretical results have been obtained for the TICS of W atoms by present semi-relativistic distorted wave approach, however there are certain discrepancies for the TICS of W⁺ ions. Differential cross sections (DCSs) have also been calculated at projectile energy 100 eV for the ionization of W atoms and W⁺ ions and the DCSs have been found to be sensitive on the scattering angle.