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中文摘要：
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,金属面的影响越来越弱;当d0增大到500a.u.时,氢负离子的光剥离截面趋近于只有弹性界面的情况.因此可以通过改变微腔上下表面的距离来调控氢负离子的光剥离.本结果对于研究负离子体系在界面附近和微腔结构中的光剥离问题具有一定的参考价值.
英文摘要：
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.
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