Ionization of W atoms and W + ions by electrons

Ionization cross sections and rate coefficients of the atom W and the ion W+ by electron impact are calculated for the electron energies from thresholds to 300 eV. The Coulomb–Born method with exchange and normalization (by the reduced K-matrix method) is used. The contribution from excitation of autoionizing levels to the single ionization as well as of inner shell ionization to the double ionization is also calculated. Results for W+ are compared with experimental data and were found to be in agreement within 20%. A similar accuracy is expected for the W atoms.