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Citation: Li Hai-Yang, Ma Chen-Sheng, Bai Ji-Ling, He Guo-Zhong. The Composition and Formation Mechanism of Negative Mn/O Binary Clusters Produced by Laser Vaporization[J]. Acta Physico-Chimica Sinica, ;1997, 13(10): 946-949. doi: 10.3866/PKU.WHXB19971017 shu

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

1.
State Key Laboratory of Molecular reaction Dynamics,Dalian Institute of Chemical Physics,Dalian 116023

Received Date: 17 March 1997
Available Online: 15 October 1997

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.
- Cluster,
- Aggregation mechanism,
- Laser vaporization,
- Time-of flight mass spectrometry,
- Binomial distribution
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