SCATTERING OF LOW-ENERGY NOBLE GAS IONS FROM METAL SURFACES.
SCATTERING OF LOW-ENERGY NOBLE GAS IONS FROM METAL SURFACES.
复制标题
低能惰性气体离子从金属表面的散射。
DOI：
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发表时间：
1967
期刊：
影响因子：
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通讯作者：
David P. Smith
中科院分区：
文献类型：
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作者：
David P. Smith
在0.5 ~ 3.0 keV的能量范围内，He+、Ne+和Ar+初级离子从多晶Mo和Ni中喷射出的正离子的能量分布由溅射离子的低能分布特征和较高能量处的尖峰组成。这些高能离子被证明是与表面原子经历了单个两体碰撞的初级离子。未检测到多电荷离子。据发现，大约，单层的吸附气体是足以防止从金属靶原子散射的入射离子的检测。He+初级离子已被用来确定CO作为吸附在Ni表面上的气体。此外，数据表明，CO分子通过C原子与Ni表面形成线性键，如先前通过其他技术观察到的。相反，当使用更多的活性气体离子作为初级时，观察到非尖锐或连续的散射离子能量分布，这表明低的能量密度和高的能量密度是导致能量分布不均匀的主要原因。
The energy distributions of positive ions ejected from polycrystalline Mo and Ni by He+, Ne+, and Ar+ primary ions in the energy range of 0.5 to 3.0 keV have been found to consist of a low‐energy distribution characteristic of sputtered ions and a sharp peak at higher energy. These high‐energy ions are shown to be primary ions which have experienced single two‐body collisions with the surface atoms. Multiply‐charged ions were not detected. It was found that, approximately, a monolayer of adsorbed gas was sufficient to prevent the detection of incident ions which have scattered from the metal target atoms. He+ primary ions have been used to identify CO as an adsorbed gas on the Ni surface. Furthermore, the data suggest that the CO molecule forms a linear bond with the Ni surface through the C atom, as has been previously observed by other techniques. In contrast, when more reactive gas ions were used as primaries, nonsharp or continuous scattered ion energy distributions were observed, suggesting that lowe...