Hyperthermal and low-energy Ne+ scattering from Au and Pt surfaces

Energy spectra of Ne- ions scattered off Au and Pt polycrystalline targets at low (200-1400 eV) and hyperthermal (down to 40 eV) energies were studied by mass-resolved ion-scattering spectrometry. Two scattering peaks with pr esumably different nature were revealed and their characteristics. namely, the relative energy position, the full-width at half-maximum (FWHM) and the normalized intensity, as a function of the primary energy were investigate d. One of these peaks, named as the binary collision approximation (BCA)-pe ak, was interpreted using the BCA model. Another one, the so-called high-en ergy (HE)-peak, was situated at an energy position near to the primary ener gy, and we explain its origins in terms of non-binary (collective) interact ions. (C) 2001 Elsevier Science B.V. All rights reserved.