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利用多光子电离技术结合飞行时间质谱仪对甲醇/水混合团簇进行了研究。在脉冲激光波长为355nm条件下观测到团簇离子。主要的电离产物为质子化的(CH3OH)n(H2O)H+(n=1-13)混合团簇离子与(CH3OH)nH+团簇离子,经分析(CH3OH)10(H2O)H+和(CH3OH)3H+为幻数结构。甲醇水混合团簇电离后团簇离子发生内部质子化转移反应是形成质子化团簇离子的主要原因。不同尺寸团簇离子信号强度随电离激光光强变化的光强指数曲线显示,团簇均发生四光子电离过程。
Methanol / water mixed clusters were studied by multiphoton ionization combined with time-of-flight mass spectrometry. Cluster ions were observed at a pulsed laser wavelength of 355 nm. The main ionization products are (CH3OH) 10 (H2O) H + and (CH3OH) n + ion with (CH3OH) n (H2O) 3H + is a magic number structure. The internal proton transfer reaction of the cluster ions after the methanol-water mixed ionization is the main reason for the formation of protonated cluster ions. The intensity-intensity curves of ion intensity of ions with different sizes with ionizing laser light intensity show that four-photon ionization occurs in the clusters.