Experimental determination of deposition induced cluster deformation

被引：24

作者：

Hovel, H ^{[1
]}

Hilger, A ^{[1
]}

Nusch, I ^{[1
]}

Kreibig, U ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany

来源：

ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS | 1997年 / 42卷 / 03期

关键词：

D O I：

10.1007/s004600050355

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

We describe an experimental method to measure the cluster deformation of metal clusters deposited on a substrate. It is based upon the sensitivity of the cluster plasmon resonance on the geometric shape of the clusters; it uses optical spectroscopy with polarized light in oblique incidence. The proposed method was applied to silver clusters (mean diameter 2R = 2nm) produced in a supersonic beam and deposited on a quartz glass substrate. Cluster deposition and optical measurements were performed in situ in vacuum. At an estimated particle velocity of 1.5.10(3)ms(-1), we evaluated an axial ratio of c/a = 0.86 for the deposition induced deformation. This result is compared to data from molecular dynamical simulations. By varying the substrate coverage, the critical cluster coverage for the onset of electromagnetic cluster-cluster coupling and coalescence was determined to amount to 0.1 cluster-monolayers.

引用

页码：203 / 208

页数：6

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