Observation of L-X-ray satellites and hypersatellites in collisions of O and Ne ions with Mo and Pd

Abstract

The satellite structure of Lα1,2 and Lβ1 X-ray transitions in 42Mo and 46Pd induced by an impact of O and Ne ions with energies 178–376 MeV have been studied with a high-resolution von Hamos crystal spectrometer. The observed M-shell satellites of the diagram Lα1,2 and Lβ1 lines are affected mostly by one- and two-vacancy configurations for oxygen ions and much more complex multi-vacancy configurations for neon impact. The L-shell hypersatellites are clearly observed in the measured spectra, both for Lα1,2 and Lβ1 X-ray transitions. The spectra are compared with the predictions of the multi-configuration Dirac–Fock (MCDF) calculations performed for up to two additional vacancies. Such MCDF calculations reproduce the main features of the M-shell satellite structure observed for oxygen ions, but they fail to describe the X-ray spectra measured for neon ions. Clearly, more complex multi-vacancy configurations have to be included in the MCDF calculations to achieve quantitative agreement in this case. The measured X-ray satellite structure for neon ions is thus interpreted by means of a simplified binomial model based on the average MCDF X-ray shifts and independent electron picture of multiple ionization of atoms by ion impact.