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Sputtering of clusters from nickel-aluminium

机译:镍铝溅射团簇

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A NiAl(111) single crystal was bombarded with 15 keV Ar+, and the resulting secondary neutrals were analysed by laser postionisation secondary neutral mass spectrometry. By measuring the individual cluster photoion intensity as a function of laser power, the sputter yields of 33 individual clusters were determined. The yield of Al-n clusters sputtered from NiAl falls with increasing cluster nuclearity as n(-8.7) while Ni-n and Alm-nNin yields are proportional to n(-5.9) and n(-5.2) respectively. The distribution of thee yields of mixed Alm-nNin clusters with n and m is found to diverge significantly from the expected distribution based on a random combinatorial approach, indicating that the energetics due to the chemical bonding in the clusters plays a significant role during cluster formation in the sputtering process. (c) 2006 Elsevier B.V. All rights reserved.
机译:用15 keV Ar +轰击NiAl(111)单晶,并通过激光离子化二次中性质谱分析所得的二次中性。通过测量单个簇的离子强度与激光功率的函数关系,可以确定33个单个簇的溅射产率。由NiAl溅射得到的Al-n团簇的产率随团簇核数的增加而下降,为n(-8.7),而Ni-n和Alm-nNin的产率分别与n(-5.9)和n(-5.2)成正比。基于随机组合方法,发现具有n和m的混合Alm-nNin团簇的产率分布与预期分布有显着差异,这表明由于团簇中的化学键所致的能量在簇团形成过程中起着重要作用在溅射过程中。 (c)2006 Elsevier B.V.保留所有权利。

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