物理化学学报 >> 1999, Vol. 15 >> Issue (01): 22-27.doi: 10.3866/PKU.WHXB19990105

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铅、硫团簇的形成、反应与光解

刘剑波, 韩春英, 郑卫军, 高振, 孔繁敖   

  1. 中国科学院化学研究所，分子反应动力学国家重点实验室，北京 100080
  • 收稿日期:1998-03-27 修回日期:1998-06-25 发布日期:1999-01-15
  • 通讯作者: 高振

Formation,Reaction and Photodessociation of Lead/Sulfur Clusters

Liu Jian-Bo, Han Chun-Ying, Zheng Wei-Jun, Gao Zhen, Kong Fan-Ao   

  1. State Key Laboratory of Molecular Reaction Dynamics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100871
  • Received:1998-03-27 Revised:1998-06-25 Published:1999-01-15
  • Contact: Gao Zhen

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摘要：

用激光直接溅射和串级溅射两种方法产生铅／硫二元团簇，并用串级飞行时间质谱仪研究了二元团簇的组份及光解规律，用激光直接溅射铜＋硫混合样品时，组成为PbnSn-1+和PbnSn-的团簇丰度最大，是二元团簇的结构骨架和稳定组份，而用激光串级溅射铅样品和硫样品，通过铅团簇与硫团簇的反应，则可得到PbnSm+(n=1-3,m=0-9)和PbnSm-(n=1-7,m=0-9). 这两种二元团簇的产生方法对应两种不同的团簇形成机理.

关键词: 铅/硫团簇, 激光溅射, 激光光解, 飞行时间质谱

Abstract:

The formation and photodissociation of Pb/S cluster ions, produced by tow different ways of laser ablation, were studied with a tandem time-of-flight mass spectrometer. By laser direct ablation on a mixed Pb+S sample, the cluster ions with the compositions of PbnSn-1+ or PbnSn- were the most abundant species and can be identified as the stable components of Pb/S cluster ions. By laser double ablation on separated Pb sample and S sample, the products were PbnSm+(n=1-3, m=0-9) and PbnSm-(n=1-7, m=0-9) formed through reactions between Pb clusters and S clusters. Form the distributions of cluster compositions and the photodissociation of clusters, we can confirm two different formation mechanisms of Pb/S clusters according to the producing ways of clusters.

Key words: Led/sulfur cluster, Laser ablation, Laer photodessociation, Time-of -flight mass spectrum