金属负离子与微孔膜的导向作用
摘要
本工作采用18 keV,14 keV和10 keV Cu~-离子入射非镀金与镀金Al_2O_3微孔膜,微孔膜的孔径为50 nm,厚度为10μm,通过对透射微孔膜离子角分布的分析,研究Cu~-离子入射Al_2O_3微孔膜的导向效应。
本论文介绍了微孔膜导向效应的研究背景和发展现状,以及兰州大学核科学与技术学院2×1.7 MV串列加速器低能离子与微孔膜作用研究实验平台。
实验测量了18 keV,14 keV和10 keV Cu~-离子入射非镀金与镀金Al_2O_3微孔膜,透射率、透射离子角分布和电荷态分布与入射离子能量和入射角的变化关系。
入射离子透射率的研究表明入射离子的透射率随入射角度增大迅速下降,但能量低的入射离子随入射角度增大下降得慢一些,入射表面镀金的微孔膜的离子的透射率随着入射角度的增大而下降的趋势比非镀金的慢。本工作还对入射离子的透射率与入射角度和入射离子能量的关系进行了理论拟合,结果显示理论拟合模型能较好地拟合各种能量的离子入射表面镀金和没有镀金微孔膜的透射率随入射角的变化关系。
透射离子电荷态的研究表明能量高的入射离子在导向过程中更容易丢失电子,而且随入射角度的增大,入射离子也更易丢失电子;通过比较不同种类的入射离子的透射离子电荷态,发现电离能高的入射离子不易丢失电子。
The angular distributions are investigated of the transmitted 10 keV、14 keV and 18 keV Cu~- ions through Al_2O_3 nanocapillaries with 50nm diameter and 10μm length. The Al_2O_3 capillaries surfaces were coated by Au or uncoated.
The research background of guiding effect is introduced.The experimental platform of the interaction between slow ions and capillaries in 2×1.7 MV accelerator in Lanzhou University is also introduced.
The transmissions of Cu~- ions through Al_2O_3 capillaries which surfaces were coated by Au or uncoated are measured,where the ions with energies of 10 keV,14 keV and 18 keV.The results indicate a significant dependence of the angular distribution,the transmission yields and the charged states of transported ions on the energy of the ions and the tilt angles.
The results exhibit that the transmission yields increase as tilt angle decreases at a given energy.The guiding effects are observed to be enhanced at lower projectile energies.Meanwhile,the transmission yield becomes larger when the capillaries surfaces were coated.In addition,the theoretical model in our work is in good agreement with the experimental result.
The study of the charged states of transported ions indicates the transmitted ions are observed to lose the electrons easier at higher projectile energy and larger tilt angle.It is also found that the transmitted ions lose the electrons easier with lower ionization energy.
本论文介绍了微孔膜导向效应的研究背景和发展现状,以及兰州大学核科学与技术学院2×1.7 MV串列加速器低能离子与微孔膜作用研究实验平台。
实验测量了18 keV,14 keV和10 keV Cu~-离子入射非镀金与镀金Al_2O_3微孔膜,透射率、透射离子角分布和电荷态分布与入射离子能量和入射角的变化关系。
入射离子透射率的研究表明入射离子的透射率随入射角度增大迅速下降,但能量低的入射离子随入射角度增大下降得慢一些,入射表面镀金的微孔膜的离子的透射率随着入射角度的增大而下降的趋势比非镀金的慢。本工作还对入射离子的透射率与入射角度和入射离子能量的关系进行了理论拟合,结果显示理论拟合模型能较好地拟合各种能量的离子入射表面镀金和没有镀金微孔膜的透射率随入射角的变化关系。
透射离子电荷态的研究表明能量高的入射离子在导向过程中更容易丢失电子,而且随入射角度的增大,入射离子也更易丢失电子;通过比较不同种类的入射离子的透射离子电荷态,发现电离能高的入射离子不易丢失电子。
The angular distributions are investigated of the transmitted 10 keV、14 keV and 18 keV Cu~- ions through Al_2O_3 nanocapillaries with 50nm diameter and 10μm length. The Al_2O_3 capillaries surfaces were coated by Au or uncoated.
The research background of guiding effect is introduced.The experimental platform of the interaction between slow ions and capillaries in 2×1.7 MV accelerator in Lanzhou University is also introduced.
The transmissions of Cu~- ions through Al_2O_3 capillaries which surfaces were coated by Au or uncoated are measured,where the ions with energies of 10 keV,14 keV and 18 keV.The results indicate a significant dependence of the angular distribution,the transmission yields and the charged states of transported ions on the energy of the ions and the tilt angles.
The results exhibit that the transmission yields increase as tilt angle decreases at a given energy.The guiding effects are observed to be enhanced at lower projectile energies.Meanwhile,the transmission yield becomes larger when the capillaries surfaces were coated.In addition,the theoretical model in our work is in good agreement with the experimental result.
The study of the charged states of transported ions indicates the transmitted ions are observed to lose the electrons easier at higher projectile energy and larger tilt angle.It is also found that the transmitted ions lose the electrons easier with lower ionization energy.
引文
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