物理学报2025，Vol.74Issue(7)：83-95,13.DOI:10.7498/aps.74.20241677
镜像电荷对低能离子在菱形微孔中传输的影响
Influence of image charges on the transport of low-energy ions in rhombic micropores
摘要
Abstract
The study of low-energy,high-charge-state ions traversing insulating nanochannels has focused on the guiding effects due to the deposition of charge,while experimental and theoretical research on the influence of image charge forces caused by the polarization of the channel walls during ion transmission is relatively scarce.In this work,the experiments on 1-keV N2+ion beams passing through muscovite microporous membranes are conducted by combining the theoretical method.Under the condition of complete discharge of the microporous membrane,the two-dimensional angular distribution of ejected ions at the initial stage of ion beam incidence at a zero-degree inclination is measured.In previous simulation calculations,first-order image force approximation and static approximation are used to calculate the image charge forces so as to simplify the calculation process.It is found that the results obtained from these calculations are still different from the experimental results.Therefore,we refine the calculation formula for image charge forces by taking into account the full effect of these forces.In previous studies of image charge forces,the influence of ion velocity on the polarization of the channel walls was neglected.The surface dielectric response theory of the image force experienced by ions within the micropores,which depends on ion velocity and the distance between the ion and the channel wall,is used to simulate and compare with the experimental results.The influence of image charge forces caused by surface dielectric response due to ion velocity on the angular distribution of ejected ions is studied.The discrepancies between the simulated and experimental two-dimensional angular distributions are found,showing that the experimental results have a wider half-height width than the simulated results. To explore the effects of beam divergence and the angle between the micropore axis and the beam on ion penetration and the two-dimensional angular distribution of ejected ions,simulation calculations for 1 keV N2+under different beam conditions are conducted,with the third-order dynamic image charge forces considered.The several potential influences in the simulation calculations are analyzed,and the influences of the true state of the beam and the angle between the beam and the micropore on the difference between simulation and experiment are assessed.This work provides the possibility for studying the surface dielectric response of micropores by using ion beams as probes.关键词
微孔膜/镜像电荷力/低电荷态离子/介电响应Key words
microporous membrane/image force/low charge state ion/dielectric response引用本文复制引用
孙文胜,万城亮,崔莹,朱丽萍,李鹏飞,王天琦,姚科,Reinhold Schuch,房铁峰,陈熙萌,张红强,袁华,刘恩顺,杜战辉,潘俞舟,樊栩宏,王麒俊,赵崭岩,陈乾..镜像电荷对低能离子在菱形微孔中传输的影响[J].物理学报,2025,74(7):83-95,13.基金项目
国家自然科学基金(批准号:u1732269,12474045)资助的课题. Project supported by the National Natural Science Foundation of China(Grant Nos.u1732269,12474045). （批准号:u1732269,12474045）
