Mn/O团簇负离子的组成规律及增长机理  

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

作　　者：李海洋[1] 马晨生[1] 白吉玲[1] 何国钟[1] 

机构地区：[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

出　　处：《物理化学学报》1997年第10期946-949,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：Time-of-flight mass spectrometry was used to investigate negative Mn-O clusters produced by 532 um 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.Time-of-flight mass spectrometry was used to investigate negative Mn-O clusters produced by 532 um 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.

关 键 词：团簇 锰 氧 增长机理 激光气化 

分 类 号：O614.711[理学—无机化学]