Ag/Se二元团簇的形成以及Ag与Se团簇反应的研究

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:(Ag₂Se)_nAg⁺],(Ag₂Se)_nAg₃⁺];负离子主要系列是:(Ag₂Se)_nAgSe^-],(Ag₂Se)_nAgSe₂^-],(Ag₂Se)_nSe^-].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AgSe_n⁺(n=4～9)和AgSe_nSe^-(n=4～7)系列的产物,在AgSe_n⁺系列中,n=4,6时丰度较大.这表明串级溅射反应和直接溅射二元混合样品两种过程中成簇机理是不同的.

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

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.