物理化学学报 >> 1999, Vol. 15 >> Issue (10): 883-889.doi: 10.3866/PKU.WHXB19991005

研究论文 上一篇    下一篇

硅、锗、锡、铅/磷二元原子团簇的形成、光解和结构

刘剑波, 韩春英, 曾嵘, 高振, 朱起鹤   

  1. 分子反应动力学国家重点实验室,中国科学院化学研究所,北京 100080
  • 收稿日期:1999-01-05 修回日期:1999-02-24 发布日期:1999-10-15
  • 通讯作者: 高振

Formation,Photodissociation and Structures of Si,Sn,Pb/P Binary Atomic Cluster lons

Liu Jian-Bo, Han Chun-Ying, Zeng Rong, Gao Zhen, Zhu Qi-He   

  1. State Key Laboratory of Molecular Reaction Dynamics,Institute of Chemistry,Beijing 100080
  • Received:1999-01-05 Revised:1999-02-24 Published:1999-10-15
  • Contact: Gao Zhen

摘要:

利用激光溅射产生了第IV主族 (硅、锗、锡、铅 ) /磷二元团簇正负离子 ,用飞行时间质谱研究了团簇离子的组成规律和激光光解产物 .研究表明二元团簇稳定性受团簇电子结构和几何结构的影响 ,但随着第IV主族元素自上而下 ,几何结构对团簇稳定性的作用越来越大 .在二元团簇离子中存在两类幻数团簇 :一类可以用Wade规则解释 ,其中磷原子或者充当给电子配体结合在第IV主族原子构成的团簇骨架外 ,或者直接参与团簇骨架的构成 ;另一类则与稳定的第IV主族中性团簇 (或磷中性团簇 )是等电子体 .利用从头计算和Wade规则对幻数团簇的结构和价键进行了分析 .

关键词: 二元原子团簇, 激光溅射, 激光光解, 分性事件质谱, Wade规则

Abstract:

 The formation and photodissociation of group Ⅳ(Si,Ge,Sn,Pb)/P binary cluster ions ,produced by laser ablation, were studied with a tandem TOF mass spectrometer. The stability of these cluster ions is influenced by their electronic and geometric structures ,and the geometric stability becomes more important for heavier group Ⅳ/P cluster ions. Two types of binary clusters marked with the magic numbers were observed: one type of magic clusters may be explained by the Wade's rule, in which P atom either attaches as electron-donating ligand to the closo-skeleton of group Ⅳatoms, or joins the closo-skeleton directly; another type of magic clusters are isoelectronic with magic species of neutral group Ⅳclusters or P clusters. The possible structures of magic cluster ions were studied by ab initio calculation and the Wade's rule.

Key words: Binary atomic clusters, Laser ablstion, Laser photodissociation, TOF mass spectrometer, Wades rule