高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (5): 743.

• 论文 • 上一篇    下一篇

Mn/Se,MnO2/Se和Mn/SeO2体系形成的团簇离子的质谱研究

陈云清, 邢小鹏, 刘鹏, 曾嵘, 高振, 朱起鹤   

  1. 分子反应动力学国家重点实验室, 分子科学中心, 中国科学院化学研究所, 北京 100080
  • 收稿日期:1900-06-09 出版日期:2000-05-24 发布日期:2000-05-24
  • 通讯作者: 高振(1939年出生),男,研究员,主要从事无机团簇研究.E-mail:gaoz@mrdlab.icas.accn E-mail:gaoz@mrdlab.icas.accn
  • 基金资助:

    国家自然科学基金(批准号:29773054)

A Study of Mn-Se and Mn-O-Se Cluster Ions Using Mass-spectrometry

CHEN Yun-Qing, XING Xiao-Peng, LIU Peng, ZENG Rong, GAO Zhen, ZHU Qi-He   

  1. Institute of Chemistry, State Key Laboratory of Molecular Reaction Dynamics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:1900-06-09 Online:2000-05-24 Published:2000-05-24

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摘要： 用飞行时间质谱法研究了激光直接溅射Mn/Se混合样品产生的二元团簇、团簇的光解行为及溅射MnO2/Se和Mn/SeO2样品产生的团簇正负离子。在Mn-Se二元团簇中,(Muse)n+是正离子的主要组分,[(Muse)nSe]-是负离子的主要组分。当n<5时,(Muse)n+的紫外光解有多种通道;n≥5时光解以剥落MuSe方式进行。激光直接溅射MnO2/Se,Mn/SeO2两种体系产生的正负离子极为相似,符合团簇的气相聚合生长机理。正离子中(Mno)n+是主要组分,负离子中Sen-,(SenO)-和(SéO3)-是主要组分。

关键词: 原子团簇, 激光溅射, 串级飞行时间质谱仪, 紫外光解

Abstract: Time-of-flight mass spectrometry was used to study Mn-Se and Mn-O-Se cluster ions produced by laser direct vaporization of solid samples. In Mn-Se binary cluster ions, (MuSe)n+ is the main composition of positive cluster ions, while [(MuSe)nSe]- is the main composition of negative cluster ions. When a mass-selected (MuSe)n+ was photolyzed, the photolysls produt ions have the same general composition (MuSe)m+. In Mn-O-Se ternary system, the main positive cluster ions produced are Mn-Obinary clusters, in which [(MnO)n]+ has a high intensity, while the negative cluster ions include Sen-,[SenO]-, [SenO3]- and [MnSen]-. It seems that the cluster ions were produced by the vaporization of solid sample and this conforms to a gas-phase aggregation mechanism.

Key words: Atomic clusters, Laser ablation, Tandem time-of-flight mass spectrometer, Ultraviolet photolysis

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