Ag/Se二元团簇的形成以及Ag与Se团簇反应的研究

Mass Spectrometric Study of Ag/Se Cluster Ions and Reaction of Ag and Se Clusters

用飞行时间质谱仪研究了激光直接溅射 Ag/Se混合样品产生的二元团簇以及团簇正离子的光解行为 ;并用串级溅射反应装置研究了 Ag和 Se正负离子产物 .在直接溅射产生的 Ag/Se二元团簇中 ,正离子主要系列是 :[(Ag2 Se) n Ag+ ],[(Ag2 Se) n Ag+ 3];负离子主要系列是 :[(Ag2 Se) n Ag Se- ],[(Ag2 Se) n Ag Se- 2 ],[(Ag2 Se) n Se- ].团簇正离子的光解结果表明 ,同样条件下 Ag/Se二元团簇正离子光解比率比 Ag/S大 .在Ag和 Se样品串级溅射实验中 ,主要得到 Ag Se+ n (n=4～ 9)和 Ag Se- n (n=4～ 7)系列的产物 ,在 Ag Se+ n 系列中 ,n=4,6时丰度较大 .

The time\|of\|flight mass spectrometry was used to study Ag/Se cluster ions produced by laser ablation of solid samples, and a Laser Double Ablation Reactor was used to study the reaction of Ag and Se clusters. In Ag/Se binary cluster ions produced by laser ablation, \[(Ag\-2Se)\-\%n\%Ag\++\], \[(Ag\-2Se)\-\%n\%Ag\++\-3\] are main compositions of positive cluster ions, while \[(Ag\-2Se)\-\%n\%AgSe\+-\], \[(Ag\-2Se)\-\%n\%AgSe\+-\-2\], \[(Ag\-2Se)\-\%n\%Se\+-\] are main compositions of negative cluster ions. The photolysis rates of positive cluster ions is higher than those of Ag/S clusters. During the laser double ablation experiment, the AgSe\++\-\%n(n\%=4\_9), AgSe\+-\-\%n(n\%=\{4\_7\}) were detected. In the series AgSe\++\-\%n\%, the ions AgSe\++\-4, AgSe\++\-6 are comparatively abundant. It seems that the clustering mechanisms in the two processes are different.