Auger electron spectra in 5.5 MeV amu-qNeq+and Arq+ion impact on Ne

A study of the Ne K Auger spectra induced by 5.5 MeV amu -1 Ne 3+ , Ne 10+ , Ar 6+ and Ar 17+ heavy ions on Ne is presented. Some average quantities (the centroid energy of the KLL Auger spectra, the average number of L vacancies produced simultaneously with the K vacancy, the effective charge of the projectile in the actual process, the satellite to total intensity ratio) characterising the KL n ionisation process have been extracted from these spectra. Relative K-shell ionisation cross sections and KLM and KLL cross section ratios have also been evaluated. The deduced experimental Z eff values have been compared with the results of PWBA and BEA calculations. A simple model calculation is made in an attempt to interpret the variation of the probability for the ejection of an L-shell electron (p L ) as a function of Z eff /v p . Some statements regarding individual lines and groups in the Auger spectra are made.