氢负离子在金属面附近光剥离截面的量子力学计算  

Quantum-mechanical Calculation of the Photodetachment Cross Section of H^- Ion near a Metal Surface

作　　者：王德华 李梦芝 宋鸿娜 任笑笑 

机构地区：[1]鲁东大学物理与光电工程学院,山东烟台264039

出　　处：《鲁东大学学报（自然科学版）》2018年第1期1-6,共6页Journal of Ludong University:Natural Science Edition

基　　金：国家自然科学基金(11374133)

摘　　要：利用量子力学方法推导出了氢负离子在金属面附近光剥离截面的近似计算公式,该公式可以表示成不存在金属面时的光滑背景项和一个与金属面有关的修改因子乘积的形式.研究表明:当激光激化方向沿着z轴方向时,光剥离截面中呈现出不规则的阶梯型的振荡结构.通过将本文的结果和半经典闭合轨道理论计算得到的结果进行比较,发现:当金属面距离氢负离子的距离比较近时,利用量子力学方法计算的光剥离截面和半经典闭合轨道理论的结果出现了一定的差距;但是当距离比较远时,两种方法计算的结果吻合较好.对于椭圆激化光,金属面对光剥离截面的影响比较小,光剥离截面趋近于不存在外场情况的光滑光剥离截面.本文的结果可以为实验研究氢负离子在表面附近的光剥离提供一定的理论指导.An approximate quantum-mechanical formula for the photodetachment cross section of H^- near a metal surface is presented,which can be written as a product of the cross section in the absence of any fields and another function depending on the metal surface and the polarization of the laser. The research shows that for the laser polarized along the z direction,the photodetachment cross section displays an irregular staircase structure. By comparing the result with the semiclassical closed orbit theory result,it is found that as the distance from the metal surface to the H^- ion is very small,there is some difference in the photodetachment cross section between the result given by the quamtum mechanical result and the semiclassical closed orbit theory result. However,as the distance is very large,the two results correspond very well with each other. For the circularly polarized laser,the influence of the metal surface to the photodetachment cross section is very small and the cross section is close to the smooth zero-field cross section. The results will guide future experimental studies for the photodetachment of negative ion near surfaces.

关 键 词：光剥离截面 量子力学方法 金属面 

分 类 号：O365[理学—流体力学]