物理化学学报 >> 1997, Vol. 13 >> Issue (10): 946-949.doi: 10.3866/PKU.WHXB19971017

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Mn/O团簇负离子的组成规律及增长机理

李海洋,马晨生,白吉玲,何国钟   

  1. 中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连 116023
  • 收稿日期:1997-03-17 修回日期:1997-04-28 发布日期:1997-10-15
  • 通讯作者: 李海洋

The Composition and Formation Mechanism of Negative Mn/O Binary Clusters Produced by Laser Vaporization

Li Hai-Yang,Ma Chen-Sheng,Bai Ji-Ling,He Guo-Zhong   

  1. State Key Laboratory of Molecular reaction Dynamics,Dalian Institute of Chemical Physics,Dalian 116023
  • Received:1997-03-17 Revised:1997-04-28 Published:1997-10-15
  • Contact: Li Hai-Yang

关键词: Mn/O团簇, 增长机理, 激光气化, 飞行时间质谱, 二项式分布

Abstract:

Time-of-flight mass spectrometry was used to investigate negative Mn-O clusters produced by 532 nm laser vaporization of MnCO3 solid pellet. Five series MnxOy-, x = 1-33, y - x= 0,1,2,3,4 cluster ions were observed. For cluster ion MnxOy with x >5, the mean valences of Mn atom in cluster MnxOy ions is 2.4±0.1, and is almost unchangeable with the size of cluster from x=5-25. The relative intensity of the observed peaks with the same x but different y, can be well fitted by a binomial distribution, for x= 5-12 clusters. All the observed information indicate a gas-phase MnO, MnO2 molecule aggregation mechanism for the production of these oxygen-rich cluster ions.

Key words: Cluster, Aggregation mechanism, Laser vaporization, Time-of flight mass spectrometry, Binomial distribution