Production of highly charged Ne ions by synchrotron radiation

Abstract Charge state spectra of Ne ions generated by photoionization from 2 to 3.3 keV X-ray with Ne atoms have been measured by the PEPICO technique. Relative abundances of Ne q + ions in charge state up to 5+ were obtained. A comparison with other experimental and theoretical data is presented. In addition, by combining the present data with various theoretical and experimental data, we have shown that double ionization of Ne atoms by fast electron impact occurs mainly via outer-shell ionization.