Scattering of low energy Na+ ions from a clean polycrystalline Ag surface

The energy distributions of low energy (E0=0.4-3.2 keV) Na+ ions scattered from a clean polycrystalline Ag surface were measured. The angle between the incident beam and the surface was fixed at psi=450 while the scattering angle (theta) ranged from 50 to 1300. The cleanliness of the surface during the measurement was maintained by simultaneous deposition of Ag atoms from an effusion source. The obtained distributions considerably differ from the corresponding distributions of noble ions. Firstly, for all measured values of E0 and theta, an intensive hump is observed in the high energy part of the distribution. In certain cases this hump is transformed into a peak. Secondly, the low energy part of the distribution is very pronounced, especially for higher values of E0 and theta. (Auth.)