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第一性原理计算Li_NBe(N=1~12)团簇的基态结构及其电子性质
First principles study of the ground-state structures and electronic properties of Li_NBe(N=1~12) clusters
【摘要】 从第一性原理出发利用密度泛函理论(DFT)计算了LiNBe(N=1-12)团簇的基态结构及其电子性质.计算结果表明:铍掺杂锂团簇LiNBe(N=1-12)的基态结构相当于Be原子取代LiN+1主团簇基态结构中一个Li原子的位置;当团簇尺寸N≥6时,杂质原子Be被束缚在主团簇笼子内;随着团簇尺寸增大,团簇的离解能和二阶能量差分均出现了奇-偶振荡;从结构稳定性上来看,Li6Be是个幻数团簇.
【Abstract】 Based on the first principles,the ground-state geometries and electronic properties of LiNBe(N=1~12) have been investigated.The results indicate that Be atom gets trapped inside the cage of LiN clusters for N≥6.With increasing size,the calculated dissociation energy and the second finite difference of total energy show the behavior of odd-even oscillation.It is found that for the Li6Be cluster,its ground-state atomic structure is most stable among all LiNBe clusters,N=6 is a magic number.
【关键词】 团簇;
基态结构;
密度泛函理论;
电子性质;
【Key words】 cluster; ground-state geometry; density functional theory; electronic property;
【Key words】 cluster; ground-state geometry; density functional theory; electronic property;
- 【文献出处】 原子与分子物理学报 ,Journal of Atomic and Molecular Physics , 编辑部邮箱 ,2007年04期
- 【分类号】O561.1
- 【被引频次】4
- 【下载频次】227