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用多光子电离技术结合飞行时间质谱仪对氨与乙醇混合团簇进行了研究。在脉冲激光波长分别为266,355nm和532nm条件下,仅在355nm作用下观测到团簇离子。主要的电离产物为质子化的(C2H5OH)n(NH3)mH+(n=0—3,m=0—4)混合团簇离子,且各个序列的离子强度随m的增大而减小。经分析,氨与乙醇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。通过理论计算得到其中性和离子团簇的稳定结构,解离能,解离通道。并证实团簇发生电离解离时发生了团簇内质子转移反应。
The mixed clusters of ammonia and ethanol were studied by multiphoton ionization combined with time-of-flight mass spectrometry. At the pulse laser wavelength of 266, 355 nm and 532 nm respectively, cluster ions were observed only at 355 nm. The main ionization products are protonated (C2H5OH) n (NH3) mH + (n = 0-3, m = 0-4) mixed cluster ions, and the ionic strength decreases with increasing m. It is analyzed that the internal proton transfer reaction of cluster ions after the ionization of ammonia and ethanol mixed clusters 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. The stable structures, dissociation energies and dissociation channels of neutral and ionic clusters were obtained theoretically. It was confirmed that intramolecular proton transfer reaction occurred when ionization and dissociation occurred in the cluster.