氢负离子在非均匀电场中的光剥离

Photodetachment of H-ion in a nonuniform electric field

在闭合轨道理论的基础上对氢负离子在非均匀电场中的光剥离进行了研究,推导给出了体系的光剥离截面的计算公式,并且对体系的光剥离截面进行了计算和分析.研究表明,除了氢负离子在均匀电场中的闭合轨道外,在非均匀电场中会产生一些额外的闭合轨道.与氢负离子在均匀电场中的光剥离截面相比较,体系中的光剥离截面的振荡情况更加复杂,表现出一个多周期振荡结构.为了清晰的表明这个系统中氢负离子的光剥离截面振荡和剥离电子的闭合轨道的关系,对这个体系的光剥离截面做了傅里叶变换.经过傅里叶变换,得到了一系列峰,其中每一个峰都对应着一个闭合轨道.

The photodetachment of H-ions in a nonuniform electric field has been investigated on the basis of closed orbit theory.We put forward an analytical formula for calculating the photodetachment cross section of this system.Our study suggests besides the closed orbit previously reported for the photodetachment of H-in a uniform electric field,some additional closed orbits are produced owing to the effect of the nonuniform electric field.Compared with the photodetachment cross section of H-in a uniform electric field,the oscillation in the cross section of my system becomes much more complicated and the cross section exhibits a multiperiodic oscillatory structure.To show the relationship between the oscillation in the photodetachment cross section and the detached electron＇s classical closed orbits clearly,we make a Fourier transformation for the scaled photodetachment cross section of this system.Each peak in the Fourier transformed cross section corresponds to the contribution of one closed orbit.This study provides a new understanding of the photodetachment of negative ions in the presence of a nonuiform electric field.