摘要
通过对二元原子簇质谱的分析，发现以同种结构和机理生长的原子簇丰度符合对数正态分布．对于离子型二元原子簇，由统计规律描述的同一系列原子簇之间相差一个或数个符合宏观元素价态的化合物集团，并且随着原子簇的增大，只有保持宏观元素价态的原子簇系列才能够保留下来．而对于共价型二元原子簇，因为没有元素价态的限制，符合统计规律的同一系列原子簇一般由加减单一元素的原子个数形成．由统计规律可以分析出可以改变的元素原子及数目．此外，离子型和共价型原子簇都可能存在一些特殊稳定的结构偏离统计规律，形成通常所谓“魔数”．
Abstract By analysing the mass spectra of binary atomic clusters, it is found that the size distribution of clusters with similar structure and same formation mechanism can be fitted by a lognormal curve. For the ion-type binary atomic clusters, the System of clusters that conforming to same lognormal curve is gotten by added or subtrated one or a few compond unit, and with the cluster size become largor, only those clusters having valences of their compond are left. For the covalence atomic clusters, the system of clusters fitted by one lognormal curve are gotten by varing atom's number of single clement, and which element or how many atoms is varied can be analysed from the statistics distribution. By funder, among ion-type clusters, as well as among covalence clusters, there are some clusters with special structure that can't be fitted by statistics laws, they formate magic numbers of mass spectrometry.
基金
国家自然科学基金
