A systematic study of doubly charged Ne2+ ions scattered from Fe (1 1 0), Ni (1 0 0) and Cu3Au (1 0 0) surfaces has been performed using low energy singly charged Ne+ projectiles (<= 7 keV). Scattered Ne2+ ions have been observed at projectile energies above a threshold. The Ne2+ yields scattered from the corresponding Fe, Ni and Cu atoms on the surfaces have been measured as a function of the primary ion energy under various scattering geometries. A charge exchange model is described for the formation and neutralisation of the scattered Ne2+ ions. Neutralisation of the Ne+ projectile along the incoming trajectory has also taken into account. A simple expression for the scattered Ne2+ ion yield is presented, which matches the experimental data well. The ionisation probability for Ne+ -> Ne2+ or Ne0 -> Ne2+ in the violent collision and the characteristic velocity ν''c for Ne2+ along the exit trajectory have been extracted by fitting the model to experimental data. For further understanding about the process involving Ne2+ ions, the inelastic energy loss associated with the scattered Ne2+ ions has also been presented and discussed.
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- LOW ENERGY ION SCATTERING;
- DOUBLY CHARGED IONS;
- CHARGE EXCHANGE;
- INNER-SHELL ELECTRON PROMOTION;
- EMPIRICAL FORMULA;