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Monoatomic And Cluster Beam Effect On Tof-sims Spectra Of Self-assembled Monolayers On Gold

机译:金原子上自组装单分子层的Tof-sims光谱的单原子和簇束效应

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Self-assembled monolayers represent well-defined systems that is a good model surface to study the effect of primary ion beams used in secondary ion mass spectrometry. The effect of polyatomic primary beams on both aliphatic and aromatic self-assembled monolayers has been studied. In particular, we analysed the variation of the relative secondary ion yield of both substrate metal-cluster (Au_n~-) in comparison with the molecular ions (M~-) and clusters (M_xAu_y~-) by using Bi~+, Bi_3~+, Bi_5~+ beams. Moreover, the differences in the secondary ion generation efficiency are discussed. The main effect of the cluster beams is related to an increased formation of low-mass fragments and to the enhancement of the substrate related gold-clusters. The results show that, at variance of many other cases, the static SIMS of self-assembled monolayers does not benefit of the use of polyatomic primary ions.
机译:自组装单分子层代表定义明确的系统,是研究二次离子质谱法中使用的一次离子束效果的良好模型表面。研究了多原子主束对脂族和芳族自组装单分子层的影响。特别是,我们使用Bi〜+,Bi_3〜分析了与分子离子(M〜-)和团簇(M_xAu_y〜-)相比,基质金属簇(Au_n〜-)相对二次离子产率的变化。 +,Bi_5〜+光束。此外,讨论了次级离子产生效率的差异。簇束的主要作用与增加低质量碎片的形成和增强与基质有关的金团簇有关。结果表明,在许多其他情况下,自组装单分子层的静态SIMS不利于使用多原子一次离子。

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