Towards quantitative LEIS with alkali metal ionsстатья
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Дата последнего поиска статьи во внешних источниках: 19 ноября 2018 г.
Аннотация:Nowadays low-energy ion scattering (LEIS) is known as a technique with the best surface sensitivity. In this paper we consider the surface composition analysis of metallic samples by means of LEIS with alkali metal ions. We review several LEIS experiments and show that widely used method of the elemental sensitivity factors calibration against reference samples does not correctly account ions neutralization, which leads to wrong results. Further, we discuss two ways to improve the accuracy of LEIS by accounting/calculating alkali metal ion neutralization. The first one is the correction of the reference samples method results, which accounts ion neutralization. Such correction can be done by using available experimental data or by calculating the neutralization probability. The second option is the direct calculation of the elemental sensitivity factors, which consists of calculation of scattering cross section by means of the binary collision model and calculation of the neutralization probability. To calculate the neutralization probability of alkali metal ion we use theoretical method, developed in previous studies. Despite the scope of the direct calculation of the elemental sensitivity factors is limited to relatively simple surfaces nowadays, in some cases, e.g. for metallic compounds, this method allows to reduce the number of experimental measurements by at least three times.