Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (5): 743.

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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

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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