钪-硫团簇的形成和光解

报道了用激光直接溅射法产生钪硫团簇, 并用串级飞行时间质谱仪研究了所产生的团簇离子的分布及紫外激光光解规律。钪硫二元团簇正负离子都是由周边硫原子包围团簇骨架而构成的, 骨架是由包含着不同数目的Sc2S3这样的组份单元组成, 它们结合紧密, 构成了稳定的钒硫团簇的核心。稳定的团簇正离子为ScS(Sc2S3)n^+和Sc2S2(Sc2S3)n^+。稳定的团簇负离子为ScS2(Sc2S3)n^-,S3(Sc2S3)n^-, (Sc2S3)n^-。周边硫原子数目随样品中硫的摩尔含量的增加而增多, 它们结合较弱, 易于剥离。在紫外光解时往往以失去S2, S4, S6的方式解离。通过分析认为具有组份单元的Sc对于S团簇的结构可能是一种笼状结构。

Formation and photodissociation of scandium-sulfide clusters

Scandium - sulfide binary cluster ions were produced by direct laser ablation and analysed by a time - of - flight mass spectroscope. The scandium - sulfide binary cluster ions are consisted of a binary skeleton and peripheral sulfur atoms. The "bear" skeleton (Sc2S3)n is the kernel of the clusters. The relative stable series of the positive cluster ions are ScS(Sc2S3)n+ and Sc2S2(Sc2S3)n+ (n =0,1,2, ...14). The relative stable series of negative ions are ScS2(Sc2S3)n- ,S3 (Sc2S3)n- and (Sc2S3)n- (n=0,l,2,...14). The number of the peripheral sulfur atoms around skeleton increases if the sulfur- rich sample is used. These peripheral sulfur atoms are easy to be stripped in photodissociation, losing S2, S4 and S6. Through the analysis, we supposed that the structure of this kind of Sc - S cluster was cage like.