物理化学学报 >> 1994, Vol. 10 >> Issue (01): 44-49.doi: 10.3866/PKU.WHXB19940111

研究论文 上一篇    下一篇

钽硫原子簇的形成及激光裂解的初步研究

张南, 于忠德, 武小军, 高振, 朱起鹤, 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:1992-06-29 修回日期:1992-11-25 发布日期:1994-01-15
  • 通讯作者: 高振

A Primary Study of the Formation and Photolysis of Tantalum Sulfide Cluster Ions

Zhang Nan, Yu Zhong-De, Wu Xiao-Jun, Gao Zhen, Zhu Qi-He, Kong Fan-Ao   

  1. Laboratory of Molecualr Reaction Dynamics Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080
  • Received:1992-06-29 Revised:1992-11-25 Published:1994-01-15
  • Contact: Gao Zhen

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摘要：

报导用激光直接溅射的方法产生了大量的钽硫原子团簇离子Ta_nS_m~+(n≤9, m≤30),并用串级飞行时间质谱仪研究了所产生团簇离子的组成及紫外激光裂解规律. 实验发现, 最稳定的团簇正离子往往具有Ta_nS_(2n+7)~+(n=1,2,…9)的组成, 相应的负离子具有, Ta_nS_(2n+3)~-(n=1,2,…9)的组成. 各种团簇正离子的激光裂解的主要通道是连续的S_2消除过程, 且对于n=3,4,5的团簇, 主要光解产物还有Ta_3S_4~+或Ta_4S_6~+离子. 据此推测出Ta_nS_m~+团簇离子的可能结构为在Ta原子周围有6个左右的S原子配位. Ta原子之间不存在直接的化学键,而较大团簇可能是以Ta_3S_4或Ta_4S_6为核心的结构.

关键词: 原子团簇离子, 激光裂解, 串级飞行时间质谱

Abstract:

Tantalum sulfide cluster ions (Ta_nS_m~+, n≤9, m≤30) were produced by direct laser ablation of a mixture of tantalum and sulfur powders and studied by a tandem timeof-flight mass spectrometer. It was found that the most stable tantalum sulfide cluster ions were Ta_mS_(2n+7)~+, (n=1-9). The main dissociation channel of the UV-photolysis (248 nm) of tantalum sulfide cluster ions is sequent S_2 loss. For cluster ions with n≥3, besides the S_2 loss channel, the photolysis yields Ta_3S_4~+, or Ta_4S_6~+, as nucleus was suggested for large tantalum sulfide cluster ions.

Key words: Tantalum sulfide cluster ions, UV-photolysis, Tandem time-of-flight mass spectrometer