Two-dimensional magic numbers in mass abundances of photofragmented bimetallic clusters

被引:114
作者
Janssens, E [1 ]
Tanaka, H [1 ]
Neukermans, S [1 ]
Silverans, RE [1 ]
Lievens, P [1 ]
机构
[1] Katholieke Univ Leuven, Vaste Stof Fys & Magnetisme Lab, B-3001 Heverlee, Belgium
来源
NEW JOURNAL OF PHYSICS | 2003年 / 5卷
关键词
D O I
10.1088/1367-2630/5/1/346
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The stability of cationic gold clusters doped with one transition metal atom was investigated by a mass spectrometric analysis of fragments resulting from high fluence irradiation of a cluster beam. Strongly enhanced abundances are found for Au5X+, X = V, Mn, Cr, Fe, Co, Zn, which implies that these species are far more stable towards fragmentation than their neighbouring cluster sizes. Here we interpret the enhanced stability of these clusters within a shell model approach for two-dimensional (2D) systems: the number of delocalized electrons in Au5X+ is six, which is a magic number for 2D systems. Quantum chemical calculations for AuNZn+ (N = 2-6) predict planar structures that are stabilized by the influence of the dopant atom. Also, the main features of the calculated molecular orbitals are well reproduced by a simple electron-in-a-box model. The present report constitutes the first observation of 2D magic numbers in size dependent properties of metal clusters.
引用
收藏
页码:46.1 / 46.10
页数:10
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