磁场对电场和金属面附近氢负离子光剥离的影响  

The Influence of the Magnetic Field on the Photodetachment of H-in Electric Field near Metal Surface

作　　者：唐田田[1] 

机构地区：[1]烟台南山学院,山东烟台265713

出　　处：《首都师范大学学报（自然科学版）》2015年第2期19-23,共5页Journal of Capital Normal University：Natural Science Edition

摘　　要：利用闭合轨道理论,研究了负离子在电场和金属面附近光剥离的磁场效应.结果表明磁场对负离子在金属面附近的光剥离可以产生很重要的影响.除了杜孟利等人在研究电场和金属面附近负离子的光剥离中发现的闭合轨道以外,还存在由于磁场的影响而产生的更多的闭合轨道.当给定负离子到金属面的距离和电场强度之后,光剥离截面随着磁场强度的变化非常敏感.磁场强度很小时,其影响可以忽略.但是随着磁场强度的增大,产生的闭合轨道数目增多,导致光剥离截面中的振荡结构变得非常复杂.因此,可以通过改变磁场的强度来调控负离子的光剥离截面.该理论结果对于将来实验研究负离子体系在表面和外电场存在时的光剥离问题提供一定的参考.Based on the closed-orbit th electric field near a metal surface produce significant effect on the eory, the magnetic field effect in the photodetachment of negative ion in the has been studied for the first time. The results show that the magnetic field can photodetachment of negative ion near metal surface. Besides the closed orbits previously found by Duet al for the H- in the electric field near a metal surface, some additional closed orbits are produced due to the effect of magnetic field. For a given ion-surface distance and electric field strength, the cross section depends on the magnetic field strength sensitively. As the magnetic field strength is very small, its influence can be neglected. With the increase of the magnetic field strength, the number of the closed orbits increases greatly and the oscillation in the cross section becomes much more complex. Therefore we can control the photodetachment cross section of the negative ion by changing the magnetic field strength. We hope that our results may guide future experimental studies for the photodetachment process of negative ion in the presence of external fields and surfaces.

关 键 词：光剥离 闭合轨道理论 磁场效应 金属面. 

分 类 号：O562[理学—原子与分子物理]