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报导用激光直接溅射的方法产生了大量的钽硫原子团簇离子Ta_nS_m~+(n≤9,m≤30),并用串级飞行时间质谱仪研究了所产生团簇离子的组成及紫外激光裂解规律。实验发现,最稳定的团簇正离子往往具有Ta_nS_(2n+7)~+(n=1,2,…9)的组成,相应的负离子具有,Ta_nS_(2n+3)~-(n=1,2,…9)的组成。各种团簇正离子的激光裂解的主要通道是连续的S_2消除过程,且对于n=3,4,5的团簇,主要光解产物还有Ta_3S_4~+或Ta_4S_6~+离子。据此推测出Ta_nS_m~+团簇离子的可能结构为在Ta原子周围有6个左右的S原子配位。Ta原子之间不存在直接的化学键,而较大团簇可能是以Ta_3S_4或Ta_4S_6为核心的结构。
It is reported that a large amount of tantalum sulfur atom cluster ions Ta_nS_m ~ + (n≤9, m≤30) are generated by laser direct sputtering method, and the composition of cluster ions generated and ultraviolet laser pyrolysis are studied by tandem time-of- flight mass spectrometry law. It is found that the most stable cluster positive ions usually have the composition of Ta_nS_ (2n + 7) ~ + (n = 1, 2, ... 9) and the corresponding negative ions have Ta_nS_ (2n + 3) , 2, ... 9). The main channel for laser pyrolysis of various clusters of positive ions is the continuous S 2 elimination process. For the clusters of n = 3, 4 and 5, the major photolysis products are also Ta 3 S 4 + or Ta 4 S 6+ ions. It is inferred that the possible structure of Ta_nS_m ~ + cluster ions is that there are 6 or so S atoms around Ta atoms. There is no direct chemical bond between Ta atoms, while larger clusters may be Ta_3S_4 or Ta_4S_6 core structure.