氢负离子在微腔中的光剥离研究

利用闭合轨道理论,研究了氢负离子在金属面和弹性界面组成的微腔中的光剥离截面.结果表明,微腔的上下表面对氢负离子的光剥离截面产生很大影响.若固定金属面与氢负离子之间的距离不变,当弹性界面与氢负离子之间的距离很大时,弹性界面对氢负离子光剥离截面的影响很小,光剥离截面的振荡幅度和振荡频率与只有金属面时的情况类似.随着弹性界面和氢负离子之间距离的不断减小,光剥离截面的振荡幅度增大,振荡频率减小.若保持氢负离子和弹性界面之间的距离不变,随着金属面和氢负离子之间距离d₀的不断增大, 关键词： 光剥离截面 闭合轨道理论 微腔

Study of the photodetachment of H- in a microcavity

Using the closed orbit theory, we studied the photodetachment cross section of H^- in a microcavity, which is made of two parallel metal and elastic surfaces. The results show that both the upper and lower surfaces of the microcavity have great influence on the photodetachment cross section of H^-. If we fix the distance between the metal surface and H^-, when the distance between the elastic surface and H^- is large, the influence of the elastic surface on the photodetachment cross section is small. The oscillation amplitude and the oscillation frequency of the cross section approach to the case of the photodetachment of H^- near a metal surface. With the decrease of the distance between the elastic surface and H^-, the oscillation amplitude is increased and the oscillation frequency is decreased. If we fix the distance between the elastic surface and H^-, with the increase of the distance d₀ between the metal surface and H^-, the influence of the metal surface is decreased. When the d₀ is increased to 500 a.u. the cross section approaches to the case of the photodetachment of H^- near an elastic surface. So we can change the distance between the upper and lower surface of the microcavity to control the photodetachment of H^-. This study provides a new understanding on the photodetachment process of H^- in the presence of surfaces and microcavity.