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Ionization Mechanism of Matrix-Assisted Laser Desorption/Ionization

机译:基质辅助激光解吸/电离的电离机理

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摘要

In past studies, mistakes in determining the ionization mechanism in matrix-assisted laser desorption/ionization (MALDI) were made because an inappropriate ion-to-neutral ratio was used. The ion-to-neutral ratio of the analyte differs substantially from that of the matrix in MALDI. However, these ratios were not carefully distinguished in previous studies. We begin by describing the properties of ion-to-neutral ratios and reviews early experimental measurements. A discussion of the errors committed in previous theoretical studies and a comparison of recent experimental measurements follow. We then describe a thermal proton transfer model and demonstrate how the model appropriately describes ion-to-neutral ratios and the total ion intensity. Arguments raised to challenge thermal ionization are then discussed. We demonstrate how none of the arguments are valid before concluding that thermal proton transfer must play a crucial role in the ionization process of MALDI.
机译:在过去的研究中,由于使用了不合适的离子与中性比,因此在确定基质辅助激光解吸/电离(MALDI)的电离机理方面存在错误。分析物的离子中性比与MALDI中的基质有很大不同。但是,这些比率在以前的研究中并未仔细区分。我们从描述离子与中性比的特性开始,并回顾早期的实验测量。接下来是对先前理论研究中所犯错误的讨论,以及对近期实验测量结果的比较。然后,我们描述一个热质子传递模型,并演示该模型如何适当地描述离子与中性的比率以及总离子强度。然后讨论了挑战热电离的论点。在论证热质子转移必须在MALDI的电离过程中起关键作用之前,我们证明了所有论点都不成立。

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