过渡金属原子簇离子结合能的光离解测量

BINDING ENERGIES OF TRANSITION METAL CLUSTERS MEASURED WITH PHOTODISSOCIATION

本实验以激光离解的方式,较系统地测量了钴、铌及其他一些过渡金属原子簇阳离子的结合能.实验结果表明:金属原子簇离子的结合能与其成族原子数关系不大,而明显地受其组分的影响.本文还探讨了金属原子簇离子的光离解机理及其几何结构模型。

The binding energies of transition metal clusters have been measured as functionsof cluster size and composition at first time. The following clusters have been stu-died. They are cobalt, niobium, iron, nickel, vanadium, tantalum and palladiumwith cluster size up to 20 atoms. The photodissociation measurement showed that thebinding energy is roughly constant with different cluster sizes but differs with differ-ent cluster compositions. For almost all clusters measured, the primary one-photonfragmentation pathway is always found to be loss of a single metal from the cluster,