高能重离子轰击非晶石墨中团簇的演化--III：溅射碳团簇的光电子能谱和速度分析
Evolution of clusters in energetic heavy ion bombarded amorphous graphite-III: Photo-emission and velocity analysis of sputtered carbon clusters
摘要：
在10 keV的负离子轰击下从石墨表面溅射的碳原子、离子和簇的诊断揭示了中性碳簇和带正电荷的物种在光发射光谱中的存在。通过速度分析仪观察到的质谱中不存在带正电荷的簇，通过带负电荷的单原子、双原子、三原子和四原子簇的存在来补充。速度谱以负C1、C2、C3和C4为主。观察到后两者具有大大降低的峰强度。这些结果有助于我们理解中性和带电粒子在重离子溅射石墨中的贡献以及碳烟形成的能量学。选择最重的惰性气体离子，以不太高的能量，即10 keV辐照。
英文摘要：
Diagnostics of the carbon atoms, ions, and clusters sputtered from a graphite surface under 10 keV Xe ion bombardments reveals the presence of neutral carbon clusters and positively charged species in the photo-emission spectra. The observed absence of the positively charged clusters in the mass spectra by a velocity analyzer is supplemented by the presence of the negatively charged monatomic, diatomic, triatomic and quatratomic clusters.. The velocity spectra are dominated by the negative C1, C2, C3 and C4. The latter two are observed having much reduced peak intensities . These results may help us to understand the contribution of neutral and charged species in the heavy-ion sputtering of graphite and the energetics of soot formation. Xe is chosen being the heaviest noble gas ion irradiating at not too high energy i.e 10 keV.
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