Photodetachment of negative ion in a gradient electric field near a metal surface  

作　　者：刘天启 王德华 韩才 刘江 梁东起 解思成 

机构地区：[1]School of Physics,Ludong University,Yantai 264025,China

出　　处：《Chinese Physics B》2012年第4期240-244,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11074104 and 10604045);the Higher Education Science and Technology Program of Shandong Province, China (Grant No. J09LA02);the University Student's Science and Technology Innovation Fund of Ludong University, China (Grant No. 10g003)

摘　　要：Based on closed-orbit theory, the photodetachment of H- in a gradient electric field near a metal surface is studied. It is demonstrated that the gradient electric field has a significant influence on the photodetachment of negative ions near a metal surface. With the increase of the gradient of the electric field, the oscillation in the photodetachment cross section becomes strengthened. Besides, in contrast to the photodetachment of H- near a metal surface in a uniform electric field, the oscillating amplitude and the oscillating region in the cross section of a gradient electric field also become enlarged. Therefore, we can use the gradient electric field to control the photodetachment of negative ions near a metal surface. We hope that our results will be useful for understanding the photodetachment of negative ions in the vicinity of surfaces, cavities, and ion traps.Based on closed-orbit theory, the photodetachment of H- in a gradient electric field near a metal surface is studied. It is demonstrated that the gradient electric field has a significant influence on the photodetachment of negative ions near a metal surface. With the increase of the gradient of the electric field, the oscillation in the photodetachment cross section becomes strengthened. Besides, in contrast to the photodetachment of H- near a metal surface in a uniform electric field, the oscillating amplitude and the oscillating region in the cross section of a gradient electric field also become enlarged. Therefore, we can use the gradient electric field to control the photodetachment of negative ions near a metal surface. We hope that our results will be useful for understanding the photodetachment of negative ions in the vicinity of surfaces, cavities, and ion traps.

关 键 词：PHOTODETACHMENT metal surface gradient electric field closed orbit theory 

分 类 号：O485[理学—固体物理]