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首页> 外文会议>DAE Solid State Physics Symposium >Elemental and Isotopic Analysis of Inorganic Salts by Laser Desorption Ionization Mass Spectrometry
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Elemental and Isotopic Analysis of Inorganic Salts by Laser Desorption Ionization Mass Spectrometry

机译：激光解吸电离质谱法的元素和同位素分析

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Laser desorption ionization mass spectrometry is applied for the analysis of elements as well as their isotopic composition in different inorganic salts. At very low laser energies the inorganic ions are desorbed and ionized from the thin layer of the sample surface. The naturally occurring isotopes of alkali and silver ions are resolved using time of flight mass spectrometer. Further increase in laser energy shows the appearance of Al, Cr, and Fe ions in the mass spectra. This indicates the penetration laser beam beyond the sample surface leading to the ablation of sample target at higher energies. The simultaneous appearance of atomic ions from the sample target at relatively higher laser energies hampers the unambiguous identification of amino acid residues from the biomolecular ions in MALDI-MS.
机译：激光解吸电离质谱法施加用于分析元件以及它们在不同无机盐中的同位素组合物。在非常低的激光能量下，无机离子从样品表面的薄层解吸并离子化。使用飞行时间质谱仪来解决碱金属和银离子的天然存在的同位素。激光能量的进一步增加显示了质谱中Al，Cr和Fe离子的外观。这表示超出样品表面的渗透激光束，导致在较高的能量下的样品靶标的消融。在相对较高的激光能量下与样品靶的原子离子的同时外观妨碍了来自马尔迪-SMS中的生物分子离子的氨基酸残基的明确鉴定。

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