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

页码：46.1 / 46.10

页数：10

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