银金硫三元团簇的形成与光过程的硫金敏化

采用激光烧蚀银金硫混合物样品产生团簇离子,用飞行时间质谱仪检测的方法研究了银金硫三元团簇离子的形成。研究表明,银硫二元团簇、金硫二元团簇和银金硫三元团簇同时生成,主要系列有(Ag~2~n~+~1S~n~-~1)^+、(Ag~2~n~-~1S~n)^-、(Ag~2~nAuS~n)^+和(Ag~2~nAuS~n~+~1)^-。将其与感光乳剂中的金硫敏化中心相关联,指出正离子团簇和负离子团簇分别在曝光过程中起着光电子陷阱和正空穴陷阱的作用。

Formation of ternary Ag/Au/S clusters and sulfur-plus-gold sensitization in photographic process

Ag/Au/S ternary clusters were generated by laser ablation on Ag/Au/S mixtures and detected with a time-of-flight(TOF) mass spectrometer. The results show that Ag/S binary clusters, Au/S binary clusters, and Ag/Au/S ternary clusters were produced simultaneously and that the main cluster series include (Ag2n 1Sn-1) , (Ag2n-1Sn)-, (Ag2n AuSn) and ( Ag2n AuSn 1)-. By correlating them with sulfur-plus-gold sensitization centers in photographic emulsions, the authors point out that the cluster cations and anions can act as photoelectron trap and positive hole trap, respectively.