We present a theoretical study of electron-impact single ionization of Ne7+(1s22s 2S) using a formulation in which the incident/scattered electron is described by distorted waves, while the final continuum states of Ne7+ are calculated by the R-matrix method, thereby incorporating the excitation-autoionization process. With nine states of the residual Ne8+ included, we have calculated single-differential and total cross sections for impact energies from the threshold energy at 8.8-80 au. The single-differential cross sections exhibit considerable structure due to autoionizing resonances, dominated by the 1s2ℓ2ℓ' states. Our calculated total cross section is in good agreement with the available experimental data and with theoretical values obtained by a close-coupling calculation. Total cross sections for ionization in which the Ne8+ is left in the 1s2s 1,3S or 1s2p 1,3Po excited states are also presented.
We have calculated total and single differential cross sections for electron impact ionization of using a method that combines the distorted-wave Born approximation for the incident/scattered electron with an R-matrix treatment of the system. Our calculation included eight states of the final ion, namely , and six states with the configuration , and up to the -pole component of the interaction between the ionizing electron and the target. The single differential cross sections exhibit considerable structure due to autoionizing resonances, including a large resonance due to the quasi-bound state . In the calculation of the total cross section, a modification to the usual half-range approximation is proposed, which ensures that the contributions from autoionizing resonances have the correct thresholds. Our theoretical results for the total cross section are in good agreement with the experimental results.
We have calculated total and single differential cross sections for electron-impact ionization of Ar9+ in its ground (1s22s22p5)2p0 state by using a method that combines the distorted-wave Born approximation and the R-matrix theory. The incident and the scattered electrons are described by distorted waves, while the wavefunctions of the initial ground state of the Ar9+ ion and its final continuum state (Ar10++e-) are calculated by using the R-matrix approach. This allows us to take into account the excitation-autoionization process. Five states of the final Ar10+ ion, namely 1s22s22p43P, 1D, 1S and 1s22s2p53P0, 1P0, have been included in our calculation. Up to the 24-pole components of the interaction with the ionizing electron were included, exciting ten distinct Ar9+ continuum symmetries. The single differential cross sections exhibit considerable structure due to autoionizing resonances. Total cross sections for production of Ar10+ in each of the five states are presented for impact energies from the threshold energy at 17.6 to 100 au. Our theoretical values for the total cross section are in fair agreement with the experimental results.
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