Abstract
New possibilities of the large-angle and small-angle ion scattering spectroscopy are demonstrated. If the target material consists of two or more isotope components it was found that the ratio of isotope parts of the quasi-single-scattering peak reaches a maximum at some incidence angle. The maximum is attributed to the fact that the ions doubly scattered from the atoms with smaller masses can have the same energy and exit angle as the ions singly scattered from the atoms with larger masses. Based on the atomic pair model (shadowing atom plus scattering atom) the mean distance between two atoms of the topmost atomic layer can be found. In the range of small scattering angles the substrate quasi-single-scattering peak as well as the recoil peak show a fine structure if the cold metal surface is covered by a thin film of condensed gases. It is postulated that such effect is connected with a multiple scattering of projectiles and recoils inside the condensed film. Multiple scattering direct the ions to the detector after single scattering from the substrate atom over the angles larger or smaller that the detection angle. This effect can be used for determination of a cleanliness of the target surface or parameters of the condensed layer (thickness or density).
Published Version
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