Abstract
Angle-resolved electron energy spectra induced by bombardment of a Ni(100) monocrystal surface with 0.5–4.5 keV energy K + ions have been measured. In the case when the target is previously implanted by K + ions a peak (discrete structure) in the energy range 15 < E < 17 eV is observed. This phenomenon has been ascribed to deactivation of M 23, vacancies of the K atom formed in the symmetrical collisions of projectiles with implanted or adsorbed surface K atoms. The phenomenon of the peak splitting at the higher projectile energies has been discussed within the frame of the Doppler effect in the specific case of symmetrical K-K collisions, where both collision participants can appear as Auger electron emitters.
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