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以脉冲激光在高真空中溅射钒粉和硫粉的混合物,产生了一系列钒硫原子簇正负离子。根据对其实验记录的激光等离子体质谱进行分析,发现钒硫原子簇的化学键基本上是共价型的,对应于相同钒原子数目的正负离子的相对丰度分别符合于不同形式的对数正态分布。正离子的相对丰度随硫原子数的增加呈对数衰减,由此可以确定各种大小簇合物的簇骼与几何构型;负离子的相对丰度则基本上呈正常的正态分布,说明在簇骼上结合了不同数量硫原子的负离子之结构稳定性大致相近。在实验中还观察到一类硫原子含量较高的簇离子,其中的部分硫原子可能在本身成键形成环状的硫集团后,又与原来的簇骼结合,因而在硫原子数较多时它们的相对丰度符合另一条对数正态分布曲线。
A pulsed laser was used to sputter a mixture of vanadium powder and sulfur powder in a high vacuum to produce a series of vanadium sulfur cluster positive and negative ions. According to the experimental records of the laser plasma mass spectrometry analysis and found that the chemical bond vanadium sulfur cluster is essentially covalent type, corresponding to the same number of vanadium atoms relative abundance of positive and negative ions in accordance with the different forms of logarithmic positive State distribution. The relative abundance of positive ions decays logarithmically with increasing number of sulfur atoms, and the cluster and geometry configurations of various sizes of clusters can be determined. The relative abundance of negative ions is basically normal distribution, It is shown that the structural stability of negative ions that combine different numbers of sulfur atoms in the cluster is roughly similar. In the experiment, we also observed a cluster of cluster ions with high content of sulfur atoms. Some of the sulfur atoms may combine with the original cluster after forming a ring sulfur group by themselves, so that when the number of sulfur atoms is large Their relative abundance corresponds to another logarithmic normal distribution curve.