摘要
随着光剥离显微技术和表面物理的发展,原子或负离子体系在外场和表面附近光剥离的研究引起了人们的广泛关注.本文利用闭合轨道理论研究了平行电场和磁场以及金属面附近氢负离子的光剥离问题.保持负离子到金属面的距离和磁场强度大小不变,我们主要研究了电场对光剥离截面的影响.结果发现:光剥离截面不仅与电场强度大小有关而且与电场方向有关.当电场方向沿+z轴时,不论电场强度大小如何都对光剥离截面有影响.当电场方向沿-z轴时,情况更加复杂,此时既可以形成向上的闭合轨道,还可以形成向下的闭合轨道,截面中的振荡也变得更复杂.此研究不仅有助于理解负离子在外场和表面附近的光剥离问题,也为将来进一步开发光剥离显微镜提供一定的参考,同时对丰富和发展该理论本身意义重大.在等离子体物理、表面科学、核聚变、激光分离同位素等高科技领域中也有重要的应用前景.
With the development of photo-detachment microscopy and surface physical,much attention has been paid to the photo-detachment of the atom or the anion system in the external fields and surface.The influence of electric field on the photodetachment of H-in magnetic field near a metal surface was studied using the closed-orbit theory with a given ion-surface distance and magnetic field strength.It is found that the photodetachment of H-in magnetic field near a metal surface is not only related to the electric field strength but also to the electric field direction.If the electric field intensity F is along the ＋ z axis and no matter what value of the F is,it all can strengthen the oscillation in the photodetachment cross section.However,if the electric field is along the-z axis,the situation becomes much more complicated.Our study will provide a new understanding on photo-detachment microscopy of anion in external fields and surfaces.And can be used to guide the future experiment research on the anion photo-detachment microscopy,and be of great significance to enrich and develop this theory and also have important application prospect on plasma physics,surface science,fusion,laser isotope separation and other hightech areas.
出处
《首都师范大学学报（自然科学版）》
2014年第3期30-36,共7页
Journal of Capital Normal University：Natural Science Edition
关键词
光剥离
闭合轨道理论
金属面
外场
photodetachment
closed-orbit theory
metal surface
external fields
