Electron-impact ionization of Ne7+

We present a theoretical study of electron-impact single ionization of Ne7(1s(2)2s S-2) using a formulation in which the incident/scattered electron is described by distorted waves, while the final continuum states of Ne7+ a re 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 ene rgies from the threshold energy at 8.8-80 au. The single-differential cross sections exhibit considerable structure due to autoionizing resonances, do minated by the 1s2l2l' states. Our calculated total cross section is in goo d agreement with the available experimental data and with theoretical value s obtained by a close-coupling calculation. Total cross sections for ioniza tion in which the Ne8+ is left in the 1s2s S-1,S-3 or 1s2P (1,3)p degrees e xcited states are also presented.