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近年来,以高能量密度的脉冲激光束在高真空中溅射固体样品,已成为产生原子簇正负离子的一种有效手段。这些簇离子是由样品分子的碎片拼接而成,或由样品分子在激光等离子体中彻底“原子化”后再组合成的?簇离子中各组分元素的含量是否与样品相同?也就是说,激光产生的团簇离子的结构与组分与样品有什么关联?为了探讨这一问题,最近我们在自制的激光等离子体源飞行时间质谱计上,以功率密度为10~8W/cm~2,波长532nm的脉冲激光
In recent years, the high energy density pulsed laser beam sputtering in high vacuum solid samples, has become an effective means of generating clusters of positive and negative ions. These cluster ions are spliced together by the fragments of the sample molecules, or by the sample molecules in the laser plasma completely “atomized” after the combination of cluster ions in each component element content is the same with the sample? That is What is the relationship between the structure and composition of the cluster ions produced by the laser and the sample? In order to explore this issue, we recently developed a laser plasma source time-of-flight mass spectrometer with a power density of 10 ~ 8W / cm ~ 2 , 532nm wavelength pulsed laser