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首页> 外文期刊>Journal of mass spectrometry: JMS >UV laser-induced desorption mechanism analyzed through two-layer alkali halide samples
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UV laser-induced desorption mechanism analyzed through two-layer alkali halide samples

机译：通过两层卤化碱样品分析紫外激光诱导的解吸机理

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摘要

Time of flight-mass spectrometry (TOF-MS) is used to analyze positive and negative desorbed ions generated by UV laser ablation of several alkali (X) halide (Y) salts. Most of the observed desorbed cluster ions have the structure (XY)(n)X+ or (XY)(n)Y-. Their desorption yields decrease as exp(-kn), where k approximate to 2 for both series, suggesting that the neutral component (XY)(n) plays the dominant role in the desorption process. Mass spectrum measurements were performed for compound samples in which two salts (out of CsI, RbI, KBr, KCl and KI) are homogeneously mixed or disposed in two superposed layers. The detection of small new ion species and large cluster ions of the original salts supports the scenario that the uppermost layers are completely atomized while deep layers are emitted colder and fragmented: It is proposed that ns-pulsed laser induced desorption of ionic salts occurs via two sequential mechanisms: (1) ejection of cations and anions in the hot plume, followed by recombination into new cluster ions and (2) ejection of relatively cold preformed species originated from deep layers or from periphery of the irradiated region.
机译：飞行时间质谱法（TOF-MS）用于分析几种碱金属（X）卤化物（Y）盐的UV激光烧蚀产生的正和负解吸离子。观察到的大多数解吸的簇离子具有（XY）（n）X +或（XY）（n）Y-结构。它们的解吸产率随着exp（-kn）的降低而降低，其中两个系列的k均接近2，这表明中性组分（XY）（n）在解吸过程中起主导作用。对化合物样品进行质谱测量，其中将两种盐（CsI，RbI，KBr，KCl和KI中的盐）均匀混合或放置在两个重叠的层中。检测小小的新离子物种和原始盐的大簇离子支持以下情况：最上层完全雾化，而较深的层则冷而碎裂：建议通过两个脉冲进行ns脉冲激光诱导的离子盐解吸顺序机制：（1）在热羽流中喷射阳离子和阴离子，然后重组为新的簇离子，（2）喷射相对较冷的预形成物种，这些物种来自深层或受辐照区域的外围。

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