氢负离子在均匀电场和金属面附近的光剥离研究

利用闭合轨道理论,计算了氢负离子在均匀电场和金属面附近的光剥离截面.结果表明,在均匀电场的基础上加上金属面之后,在电离阈附近氢负离子的光剥离截面发生了很大的变化,和仅有均匀电场存在时的光剥离截面相比,截面的振荡幅度增大,振荡频率减小.并且在电场强度相同时,随着金属面与氢负离子距离的不断增大,光剥离截面振荡的幅度不断减小,振荡的频率不断增大,当金属面和氢负离子的距离增大到一定值时,金属面的影响消失,氢负离子的光剥离截面趋近于只有电场存在时的情况.这一结果对于研究负离子体系在界面附近的光剥离问题具有一定的参考价值.

Photodetachment of H~- ion in a uniform electric field near a metal surface

Using the closed orbit theory, we calculate the photodetachment cross section of H^-ion in a uniform electric field near a metal surface. The results show that the photodetachment cross section of H^- near the threshold has a significant change after the metal surface has been placed in the uniform electric field. Compared with the situation of the photodetachment of H^- ion in a single uniform electric field, the oscillating amplitude of the photodetachment cross section of this system is increased and the oscillating frequency is decreased. If we keep the electric field strength at a given value, we find that with the increase of the distance between the metal surface and the H^- ion, the oscillating amplitude of the photodetachment cross section decreases and the oscillating frequency increases. When the ion-to-surface distance increases to a certain value, the influence of the metal surface disappeared, and the photodetachment cross section approaches the photodetachment cross section of H^- in a uniform electric field.