Alkali ion scattering spectroscopy

The first study of Sn deposition on Pt( 111) was reported by Paffet and Windham in 1989 [42] and a subsequent one on the same system was published by Campbell in 1990 [1]. In both studies, two LEED patterns were observed after annealing a 2x2 and a ( /3x v ) R30°. Both superstructures were interpreted in terms of incorporation of the tin layer in the first platinum layer, but only a qualitative examination of the LEED pattern was performed. Subsequently the results of low energy alkali ion scattering spectroscopy ALISS [43, 21] could be quantitatively interpreted as due to ordered, single atomic layer surface alloys. The ion scattering results have been confirmed and expanded by a quantitative LEED study [34]. The atomic structure of both phases corresponds exactly to that of the topmost layer of the phases with the same periodicity observed on the on PtsSnflll). The LEED and ALISS results for the Sn/Pt(lll) system were confirmed by a recent STM study reported by Batzill et al. [44]. Even though atomic resolution was not attained in this study (only the surface unit mesh could be observed), the results are closely comparable to the atomically resolved ones obtained on the PtaSn(l 11) surface [35]. 

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