利用密度泛函理论中的广义梯度近似(GGA)对PbnS(n=1~13)团簇进行几何结构优化,并对能量和频率进行计算,得到了PbnS(n=1~13)团簇的基态结构和稳定结构.计算结果表明:PbnS团簇的平均结合能比Pbn团簇的平均结合能要大,且n=4和10为PbnS团簇的幻数.在PbnS团簇中,电荷都是从Pb原子向S原子转移且以共价键和离子键共存.
Geometric structures of PbnS(n=1-13) clusters are optimized using the generalized gradient approximation(GGA) density functional theory, The energy and frequency are calculated, the ground state structures and equilibrium structures of Pb, S(n = 1 - 13)clusters are obtained. The calculated results show that the average binding energy of Pb.S clusters is higher than that of Pbn clusters,and 4 and 10 are the magic numbers of PbnS clusters. Charge transfers from the Pb atom to the S atom and co-existence of ionic and covalent bonding in PbnS clusters.