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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Endohedral beryllium atoms in ten-vertex germanium clusters: Effect of a small interstitial atom on the cluster geometry
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Endohedral beryllium atoms in ten-vertex germanium clusters: Effect of a small interstitial atom on the cluster geometry

机译:十顶点锗簇中的内面铍原子:小间隙原子对簇几何的影响

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摘要

Ten-vertex clusters are unusually versatile because polyhedra with 3-, 4-, and 5-fold symmetry are possible and are found in experimentally known structures. Such clusters therefore provide useful probes for subtle effects on cluster structure such as changing the electron count or introducing an interstitial atom. In this connection, DFT shows that one of the smallest possible interstitial atoms, namely beryllium, has relatively little effect on the structures of Be@Ge_(10)~z (z = +2, 0, -2, -4) clusters. Thus the same C_(3v) and D_(4d) polyhedra are found as the lowest energy structures for the isoelectronic pairs Be@Ge_(10)~(2+)/Ge_(10) and Be@Ge_(10)/Ge_(10)~(2-). Even for the more complicated potential energy surfaces of the Be@Ge_(10)~(2-)/Ge_(10)~(4-) and Be@Ge _(10)~(4-)/Ge_(10)~(6-) systems, the lowest energy structures are remarkably similar. Thus the same C_(2v) structures are the global minima for both Be@Ge_(10)~(2-) and Ge_(10)~(4-). Similarly, the same slipped pentagonal prism structures are the global minima for both Be@Ge_(10)~(4-) and Ge_(10)~(6-).
机译:十顶点簇具有非同寻常的用途,因为具有3倍,4倍和5倍对称性的多面体是可能的,并且可以在实验已知的结构中找到。因此,此类团簇提供了有用的探针,可用于对团簇结构产生细微影响,例如改变电子数或引入间隙原子。在这方面,DFT表明,可能的最小间隙原子之一,即铍,对Be @ Ge_(10)〜z(z = +2,0,-2,-4)团簇的结构影响相对较小。因此发现相同的C_(3v)和D_(4d)多面体是等电子对Be @ Ge_(10)〜(2 +)/ Ge_(10)和Be @ Ge_(10)/ Ge_( 10)〜(2-)。甚至对于Be @ Ge_(10)〜(2-)/ Ge_(10)〜(4-)和Be @ Ge _(10)〜(4-)/ Ge_(10)〜的更复杂的势能面(6-)系统的最低能量结构非常相似。因此,相同的C_(2v)结构是Be @ Ge_(10)〜(2-)和Ge_(10)〜(4-)的全局最小值。类似地,对于Be @ Ge_(10)〜(4-)和Ge_(10)〜(6-),相同的滑动五角棱镜结构是全局最小值。

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