Calculation of Electron Impact Single Ionization TDCS of Tungsten Atoms at 200, 500 and 1000 eV

Ghanshyam Purohit

doi:10.3390/atoms9020031

Abstract

We report triple differential cross-sections (TDCSs) for the electron impact single ionization of tungsten atoms for the ionization taking place from the outer sub shells of tungsten atoms, viz. W (6s), W (5d), W (5p) and W (4f). The study of the electron-induced processes such as ionization, excitation, autoionization from tungsten and its charged states is strongly required to diagnose and model the fusion plasma in magnetic devices such as Tokamaks. Particularly, the cross-section data are important to understand the electron spectroscopy involved in the fusion plasma. In the present study, we report TDCS results for the ionization of W atoms at 200, 500 and 1000 eV projectile energy at different values of scattered electron angles. It was observed that the trends of TDCSs for W (5d) are significantly different from the trends of TDCSs for W (6s), W (5p) and W (4f). It was further observed that the TDCS for W atoms has sensitive dependence on value of momentum transfer and projectile energy.

Highlights

The study of the charged particle impact ionization of atomic, ionic and molecular targets has been of importance for a long time, having several potential applications, a few of which are semiconductor physics, the diagnostics and modeling of fusion plasmas, physics and chemistry of atmosphere, effect of ionizing radiation on biological tissues, etc
Knowledge of atomic processes such as electron impact excitation and ionization and electron ion recombination is essential to understand the possible impact of tungsten on fusion plasma in the form of an impurity [18,19] and the cross-section data of these processes are required for modeling and diagnostics of the plasma
We report the triple differential cross-sections (TDCSs) results obtained for the electron impact single ionization of W atoms at various projectile energies, i.e., 200, 500 and 1000 eV for ejected electron energy 2 eV and 10 eV for different scattering angles

Summary

Introduction

The study of the charged particle impact ionization of atomic, ionic and molecular targets has been of importance for a long time, having several potential applications, a few of which are semiconductor physics, the diagnostics and modeling of fusion plasmas, physics and chemistry of atmosphere, effect of ionizing radiation on biological tissues, etc.

Results

Conclusion