We report X-ray spectra from Ar17+ impacting a SiO2 surface at 30° from normal incidence, for projectile energies ranging from 3 to 137 keV. At the highest energy we see only X-rays from the filling of the argon K shell. As the projectile energy is reduced, these argon X-rays are gradually reduced to zero while a silicon Kα peak appears. We interpret these data to be the result of the onset of a direct transfer of a silicon K-shell electron to the K-shell vacancy in the argon projectile. We suggest that this transfer occurs through an argon-silicon Auger process which takes place during a close collision in the solid. The velocity dependence of this process is not yet fully understood.
|Number of pages||4|
|Journal||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|Publication status||Published - Apr 1997|
ASJC Scopus subject areas
- Nuclear and High Energy Physics