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氦液滴中形成的大 Ag 团簇的表面沉积和成像。

Surface deposition and imaging of large Ag clusters formed in He droplets.

机构信息

Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA.

出版信息

J Phys Chem A. 2011 Jun 30;115(25):7199-204. doi: 10.1021/jp200198n. Epub 2011 Apr 12.

DOI:10.1021/jp200198n
PMID:21486053
Abstract

The utility of a continuous beam of He droplets for the assembly and surface deposition of Ag(N) clusters, ~ 300-6000, is studied with transmission electron microscopy. Images of the clusters on amorphous carbon substrates obtained at short deposition times have provided for a measure of the size distribution of the metal clusters. The average sizes of the deposited clusters are in good agreement with an energy balance based estimate of Ag(N) cluster growth in He droplets. Measurements of the deposition rate indicate that upon impact with the surface the He-embedded cluster is attached with high probability. The stability of the deposited clusters on the substrate is discussed.

摘要

利用一束连续的氦原子束实现了 Ag(N) 团簇 ( ~ 300-6000) 的组装和表面沉积,利用透射电子显微镜对此进行了研究。在短沉积时间内获得的非晶碳衬底上的团簇图像提供了金属团簇尺寸分布的度量。沉积团簇的平均尺寸与基于氦液滴中 Ag(N) 团簇生长的能量平衡的估计值非常吻合。沉积速率的测量表明,在与表面碰撞时,氦嵌入的团簇极有可能附着。还讨论了沉积在衬底上的团簇的稳定性。

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