Reducing the Matrix Effect in Organic Cluster SIMS Using Dynamic Reactive Ionization
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- 作者：Hua Tian ; Andreas Wucher ; Nicholas Winograd
- 关键词：Ar gas cluster ion beam ; Dynamic reactive ionization ; Secondary ion mass spectrometry ; Depth profiling ; Matrix effect ; Irganox
- 刊名：Journal of The American Society for Mass Spectrometry
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：27
- 期：12
- 页码：2014-2024
- 全文大小：921 KB
- 刊物主题：Analytical Chemistry; Biotechnology; Organic Chemistry; Proteomics; Bioinformatics;
- 出版者：Springer US
- ISSN：1879-1123
- 卷排序：27
文摘
Dynamic reactive ionization (DRI) utilizes a reactive molecule, HCl, which is doped into an Ar cluster projectile and activated to produce protons at the bombardment site on the cold sample surface with the presence of water. The methodology has been shown to enhance the ionization of protonated molecular ions and to reduce salt suppression in complex biomatrices. In this study, we further examine the possibility of obtaining improved quantitation with DRI during depth profiling of thin films. Using a trehalose film as a model system, we are able to define optimal DRI conditions for depth profiling. Next, the strategy is applied to a multilayer system consisting of the polymer antioxidants Irganox 1098 and 1010. These binary mixtures have demonstrated large matrix effects, making quantitative SIMS measurement not feasible. Systematic comparisons of depth profiling of this multilayer film between directly using GCIB, and under DRI conditions, show that the latter enhances protonated ions for both components by 4- to ~15-fold, resulting in uniform depth profiling in positive ion mode and almost no matrix effect in negative ion mode. The methodology offers a new strategy to tackle the matrix effect and should lead to improved quantitative measurement using SIMS.