High-resolution Ne K Auger spectra from collisions between Ne and H+, Ne3+, Ne10+, Ar6+, and Ar16+ (5.5 MeV/u).

Abstract

Energetic heavy-ion-impact-induced Ne KLL Auger spectra have been studied by a high-resolution electron spectrometer. To analyze the complex Auger spectra in which many satellite lines are included stemming from multiply ionized neon states, the measured series of interrelated spectra was used with the help of a properly developed computerized procedure. Energy and intensity of the lines in the spectra were determined, and an identification procedure was carried out for all the vacancy configurations from Li-like states to the F-like states (diagram lines). The results were compared with the corresponding theoretical transition energy and intensity values. Based on the above results it was possible to obtain information on the multiple-ionization process at the impact-parameter region of the K-shell ionization. Thus, we have determined the two-dimensional vacancy configuration distribution (2s,2p vacancies) for all the states attainable by Auger transitions. The experimentally determined vacancy configuration distributions did not show any significant difference from the predictions of the independent-particle model. In addition, no definite tendency was found in the ionization probabilities as a function of the degree of ionization.