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研究原子团簇上小分子的吸附和反应对认识一些复杂化学过程的微观机理非常重要,为了表征小分子如何吸附在原子团簇上,我们研制了一套氦原子碰撞诱导解离串级飞行时间质谱装置.该装置配有激光溅射团簇源,团簇在快速流动管里与一氧化碳、水等小分子发生反应,产物团簇通过第一级飞行时间质谱“选质”后与一束氦气(He)发生碰撞,使用第二级飞行时间质谱检测碰撞碎片的分布.结果表明:一些过渡金属氧化物团簇上小分子的弱吸附、强吸附以及氧化性吸附能够通过该实验装置进行表征.
Studying the adsorption and reaction of small molecules on atomic clusters is very important for understanding the micro-mechanism of some complicated chemical processes. In order to characterize how small molecules are adsorbed on atomic clusters, we developed a set of helium atom collision-induced dissociation tandem time of flight mass spectrometry The device is equipped with a laser sputtering cluster source, the clusters react with small molecules such as carbon monoxide and water in a fast-flowing tube, and the clusters pass through the first-level time-of-flight mass spectrometry (He) were collided, and the distribution of collisional debris was detected by second order time-of-flight mass spectrometry.The results showed that weak adsorption, strong adsorption and oxidative adsorption of small molecules on some transition metal oxide clusters could be characterized by this experimental apparatus .