Abstract: 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, [(Ag₂Se)_nAg⁺], [(Ag₂Se)_nAg₃⁺] are main compositions of positive cluster ions, while [(Ag₂Se)_nAgSe^-], [(Ag₂Se)_nAgSe₂^-], [(Ag₂Se)_nSe^-] are main compositions of negative cluster ions. The photolysis rates of positive cluster ions is higher than those of Ag/Sclusters. 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 AgSe₄⁺, AgSe₆⁺ are comparatively abundant. It seems that the clustering mechanisms in the two processes are different.

Key words: Laser ablation, Time-of-flight mass spectrometer, Clusters reaction, Ag/Se atom clusters