Bin Ding , Chenxi Han , Bo Jin, Xiaogang Wang, Yibin Mao, Yue Guo, Guang Zhong, Yanling Guo, Lin Chen, Ximeng Chen
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引用次数: 0
Abstract
The resonant charge transfer process based on the jellium model of free electron gas is normally used to explain the neutralization of alkali-metal ions scattering on metal surfaces with low work functions. However, we find it cannot adequately account for the angle dependent neutralization of keV-energy Na+ ions in grazing scattering on Al(100) and Al(110) surfaces. The bell shape of the angle dependent neutralization is observed for Al(110) in contrast to the opposite shape for Al(100). In particular, Na2+ ions are observed at the rough Al(100) surface, which provides direct evidence of electron excitation in Na-Al collisions. The neutralization of the non-specular scattering for Na-Al systems is dominated by the combination of the resonant charge transfer and the electron promotion mechanisms.
期刊介绍：
Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences.
A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below.
The scope of the journal includes:
1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes).
2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis.
3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification.
4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.
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