采用900 e V能量的电子对直玻璃管进行了穿透实验,测量了玻璃管在倾角为–0.15°,–0.4°和–1.15°时充电过程角分布的时间演化,以及平衡态下出射电子能谱.发现穿透率随时间先下降后上升最后趋于平稳,下降的时间随倾角的...采用900 e V能量的电子对直玻璃管进行了穿透实验,测量了玻璃管在倾角为–0.15°,–0.4°和–1.15°时充电过程角分布的时间演化,以及平衡态下出射电子能谱.发现穿透率随时间先下降后上升最后趋于平稳,下降的时间随倾角的增大而减小.当倾角为–0.4°和–1.15°时,电子穿透率下降到最低点时几乎看不到穿透电子(穿透率小于3‰),这种穿透率最低点状态保持时间随倾角增大而增大.穿透电子的角分布中心随着时间变化.在平稳状态时,发现穿透电子的能量损失随倾角增大而增大.采用蒙特卡罗方法模拟了电子经过管壁不同次数反射后的能谱,与测量能谱进行对比,发现–0.15°,–0.4°和–1.15°倾角下,穿透电子分别经历了管壁的一次、两次和三次与表面的反射过程.基于此,本文对电子穿越玻璃管的充电过程动力学给出了物理解释.实验结果和理论分析表明,在小倾角下玻璃管内能形成宏观负电荷累积,排斥后续电子形成反射,增加电子出射概率,这对应用绝缘体微结构,例如玻璃锥管产生稳定的电子微束具有重要的参考意义.展开更多
We report beam-foil measurements of the spectrum for Ar 1Ⅱ.Totally 56 lines are measured.Most of them are mainly ascribed to 3d-4p,4s-4p,4p-4d and 4p-5s resonance transitions.These spectral lines are identified,among...We report beam-foil measurements of the spectrum for Ar 1Ⅱ.Totally 56 lines are measured.Most of them are mainly ascribed to 3d-4p,4s-4p,4p-4d and 4p-5s resonance transitions.These spectral lines are identified,among which 16 lines are new and accurately measured.Analyses of the spectra are based on a comparison with the other experimental results and calculated vaJues.展开更多
We report light emission during the bombardment of Kr^(17+) ions on an Al surface in the wavelength range 300–700 nm.The three spectral lines of the sputtered Al atoms belong to transitions of Al I–at 309.26,Al I–4...We report light emission during the bombardment of Kr^(17+) ions on an Al surface in the wavelength range 300–700 nm.The three spectral lines of the sputtered Al atoms belong to transitions of Al I–at 309.26,Al I–4s 2S1/2 at 394.72 and Al I 3p^(2)P°_(3/2)–4_(s)^(2)S_(1/2) at 396.50 nm.During the neutralization process,the seven spectral lines of Kr I and Kr II from the incident ion of Kr^(17+)attribute to transitions of Kr I 5p^(2)[3/2]2–7d^(2)[1/2]°1 at 616.33,Kr II 5s ^(2)D_(5/2)–5p ^(2)D°_(3/2) at 410.86,Kr II 5p 4P°_(5/2)–6s 4P_(5/2) at 430.58,Kr II 4d^(2)D_(3/2)–4f ^(2)[3]°_(5/2) at 434.42,Kr II 4d ^(4)D_(1/2)–5p ^(2)S°_(1/2) at 485.80,Kr II 4p ^(4)S_(3/2)–6s ^(4)P°_(3/2) at 618.57 and Kr II 5p 4P°_(3/2)–4d ^(2)D_(5/2) at 656.41 nm.Light emissions of sputtered species depend on energy of the incident ions deposited on the target surface atoms.Light emissions of the neutralized projectiles are formed due to many electrons of the conduction band of the solid surface captured in excited states of the incident ion.展开更多
文摘采用900 e V能量的电子对直玻璃管进行了穿透实验,测量了玻璃管在倾角为–0.15°,–0.4°和–1.15°时充电过程角分布的时间演化,以及平衡态下出射电子能谱.发现穿透率随时间先下降后上升最后趋于平稳,下降的时间随倾角的增大而减小.当倾角为–0.4°和–1.15°时,电子穿透率下降到最低点时几乎看不到穿透电子(穿透率小于3‰),这种穿透率最低点状态保持时间随倾角增大而增大.穿透电子的角分布中心随着时间变化.在平稳状态时,发现穿透电子的能量损失随倾角增大而增大.采用蒙特卡罗方法模拟了电子经过管壁不同次数反射后的能谱,与测量能谱进行对比,发现–0.15°,–0.4°和–1.15°倾角下,穿透电子分别经历了管壁的一次、两次和三次与表面的反射过程.基于此,本文对电子穿越玻璃管的充电过程动力学给出了物理解释.实验结果和理论分析表明,在小倾角下玻璃管内能形成宏观负电荷累积,排斥后续电子形成反射,增加电子出射概率,这对应用绝缘体微结构,例如玻璃锥管产生稳定的电子微束具有重要的参考意义.
基金Supported by the National Natural Science Foundation of China under Grant No 11174296.
文摘We report beam-foil measurements of the spectrum for Ar 1Ⅱ.Totally 56 lines are measured.Most of them are mainly ascribed to 3d-4p,4s-4p,4p-4d and 4p-5s resonance transitions.These spectral lines are identified,among which 16 lines are new and accurately measured.Analyses of the spectra are based on a comparison with the other experimental results and calculated vaJues.
基金Supported by the National Natural Science Foundation of China under No 11174296.
文摘We report light emission during the bombardment of Kr^(17+) ions on an Al surface in the wavelength range 300–700 nm.The three spectral lines of the sputtered Al atoms belong to transitions of Al I–at 309.26,Al I–4s 2S1/2 at 394.72 and Al I 3p^(2)P°_(3/2)–4_(s)^(2)S_(1/2) at 396.50 nm.During the neutralization process,the seven spectral lines of Kr I and Kr II from the incident ion of Kr^(17+)attribute to transitions of Kr I 5p^(2)[3/2]2–7d^(2)[1/2]°1 at 616.33,Kr II 5s ^(2)D_(5/2)–5p ^(2)D°_(3/2) at 410.86,Kr II 5p 4P°_(5/2)–6s 4P_(5/2) at 430.58,Kr II 4d^(2)D_(3/2)–4f ^(2)[3]°_(5/2) at 434.42,Kr II 4d ^(4)D_(1/2)–5p ^(2)S°_(1/2) at 485.80,Kr II 4p ^(4)S_(3/2)–6s ^(4)P°_(3/2) at 618.57 and Kr II 5p 4P°_(3/2)–4d ^(2)D_(5/2) at 656.41 nm.Light emissions of sputtered species depend on energy of the incident ions deposited on the target surface atoms.Light emissions of the neutralized projectiles are formed due to many electrons of the conduction band of the solid surface captured in excited states of the incident ion.
