本文构建了Si82笼状分子的具有G2v对称性的初始原子结构模型。采用基于密度泛函的第一性原理方法对其结构进行优化计算。研究发现:经过结构驰豫,Si82分子对称性从C2v下降为Cs,部分硅原子从顶点位置向内凹陷,导致键长和键角均发生变化。对Si82笼状分子的稳定性、轨道分布和电荷分布等性质进行了分析和讨论。
The structure study for large Si82 cage using ab initio calculations based on density functional theory was reported. The results show that Sis2 cages are distorted from perfect C2v symmetry to Cs, symmetry. The geometry, electronic properties and charge population for Sis2 cages are discussed.