计算物理 ›› 2013, Vol. 30 ›› Issue (4): 587-595.

• 论文 • 上一篇    下一篇

WmCn(m+n≤7)团簇的几何结构与稳定性

张秀荣1, 李维军2, 张福星2, 袁爱华3   

  1. 1. 江苏科技大学数理学院, 镇江 212003;
    2. 江苏科技大学材料科学与工程学院, 镇江 212003;
    3. 江苏科技大学生物与化学工程学院, 镇江 212003
  • 收稿日期:2012-09-10 修回日期:2013-01-18 出版日期:2013-07-25 发布日期:2013-07-25
  • 作者简介:张秀荣(1957-),女,教授,从事计算原子与分子物理和团簇的研究,E-maili:zh4403701@126.com
  • 基金资助:
    国家自然科学基金(51072072);江苏省自然科学基金(BK2010343)资助项目

Structures and Stability of WmCn Clusters

Zhang Xiurong1, Li Weijun2, Zhang Fuxing2, Yuan Aihua3   

  1. 1. School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    3. School of Biology and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
  • Received:2012-09-10 Revised:2013-01-18 Online:2013-07-25 Published:2013-07-25

摘要: 利用密度泛函理论(DFT)中的杂化密度泛函B3LYP方法在LANL2DZ基组水平上对WmCn(m+n≤7)团簇进行几何构型全优化,得出它们的基态结构,并计算基态结构的平均结合能、二阶能量差分、能隙及键级.结果表明:随着W原子个数的增加,团簇的结构由线性转变为平面,再转变为立体结构,其中自旋多重度未超过5;C原子的掺杂增强团簇的稳定性;分析团簇Wiberg键级可知,团簇中W-C键级明显大于W-W和C-C键级,表明WmCn(m+n≤7)团簇最容易形成W-C键.

关键词: WmCn团簇, 基态结构, 稳定性, 密度泛函理论

Abstract: Possible equilibrium geometries of WmCn clusters are optimized by using density functional theory at B3LYP/LANL2DZ level.For ground-state structures,average binding energy,second difference in energy,HOMO-LOMO gaps and the Wiberg bond index are analyzed.With increasing tungsten atoms,structures of clusters transform from linear into planar,and then become three-dimensional structures.All spin multiplicity is not more than 5.Hybridization of carbon atoms enhanced stability of the clusters,but reduced chemical activity.And Wiberg of W-C is much stronger than that of W-W and C-C,so it is easier to form W-C bond in WmCn clusters.

Key words: WmCn(m+n≤7)clusters, ground-state structures, stability, density functional theory

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