Electron-impact ionization of hydrogenlike ions in QED theory

Electron-impact ionization cross section calculations for lithium-like ions

“…Simultaneously, because the incident electron spends more time to interact with target near the threshold, the exchange effects become more significant. Moreover, the radial integral W pb R λ W si in the interchange terms [40] become larger; thus the interchange terms contribute significantly near the threshold. However, the bound electrons are more tightly bound together, so there are fewer opportunities to exchange with the incident electron for higher-Z ions.…”

Calculations of electron-impact ionisation of ${\mathrm{Fe}}^{25+}$ and ${\mathrm{Fe}}^{24+}$

“…In figure 1 we present results of our CCC, RCCC, DW and RDW calculations for the electron-impact total ionisation cross section. We compare with experiment [25], the present RDW results (Dirac potential), the RDW results of [21] (GBI potential, obtained from the fitting formula equation (39), the fitting accuracy is less than 2%), and nonrelativistic DW calculations (denoted by DWBA; performed on-line at the LANL website [50]). We find a very good agreement between the nonrelativistic CCC and DWBA models.…”

“…The present RCCC, CCC, RDW and DWBA calculations are described in the text. The RDW-GBI calculations are due to [21]. The experiment is due to [25].…”

“…Similarly, for Fe 24+ there have been a large number of close-coupling and perturbative calculations of excitation cross sections [16][17][18][19][20]. For electron-impact ionisation the relativistic distorted wave (RDW) method has been used to calculate cross sections for Fe 25+ [21,22]. A formalism for calculation of the 1s ionisation cross sections using the RDW method was developed in [23,24] and the effect of the quantum electrodynamics (QED) corrections to the Coulomb interaction on the ionisation cross sections was investigated.…”