Negative ion production in energetic O − and C − ions scattering on HOPG
| Autor: | Yanling Guo, Feifei Xiong, Yunqing Xiao, Jianjie Lu, Shunli Qiu, Pinyang Liu, Lin Chen, Lei Gao, Ximeng Chen, Yuefeng Liu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Work (thermodynamics) Chemistry Scattering chemistry.chemical_element 02 engineering and technology Escape velocity 021001 nanoscience & nanotechnology 01 natural sciences Oxygen Ion Highly oriented pyrolytic graphite Physics::Plasma Physics 0103 physical sciences Specular reflection Atomic physics 010306 general physics 0210 nano-technology Instrumentation Carbon |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 406:425-430 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2017.02.021 |
| Popis: | In this work, we present negative-ion fractions as a function of exit velocity and angle after keV-energy negative oxygen and carbon ions scattering on a highly oriented pyrolytic graphite (HOPG) surface, at a scattering angle of 38°. The negative-ion fractions increase monotonously with the increase of exit velocity for specular scattering, while negative-ion fractions present a bell-shaped dependence on exit angle. In order to gain further insight into the nature of charge transfer on HOPG, a modified charge transfer model involving the contribution of positive ions has been proposed and roughly reproduced the velocity and angle dependences of negative-ion fractions. |
| Databáze: | OpenAIRE |
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