Abstract
Abstract We have investigated electron-impact ionization (EII) for the ground level 5d46s D 6 1 / 2 and the two metastable levels 5d5 S 6 5 / 2 and 5d36s2 F 4 3 / 2 of W+ forming W2+ by theoretical calculation using the flexible atomic code based on a distorted-wave (DW) approximation. It is found that the direct ionization (DI) of a 5d and 6s electron is largely sensitive to the choice of optimization configurations for the single, atomic local central potential used in bound and continuum orbitals descriptions of both the initial and the final states. The DI cross section is reduced by as much as 60% for the variation of the optimization configurations. Indirect excitation–autoionization (EA) cross sections for the 5d and 6s → nl (5 ≤ n ≤ 30) and 4f, 5s and 5p → nl (n = 5 and 6) transitions have been calculated with the detailed branching ratios. Experiments are about 28% lower than our theoretical predictions for the total EII cross sections of the ground level 5d46s D 6 1 / 2 and the metastable level 5d5 S 6 5 / 2 at the peak. This is due to the large contribution of the EA though the DI cross section is significantly reduced than previous theoretical works and experiments.
Published Version
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