Photodetachment of H- in a Metallic Microcavity

Using closed orbit theory, we study the photodetachment of H- in a metallic microcavity. An analytical formula of the photodetachment cross section is derived. It is found that the two-mirror metallic microcavity has a greater enhancement effect on the oscillations of the photodetachment cross section compared to the case of a single mirror configuration. The oscillations in the photodetachment cross section are caused by the superposition of the interference waves traveling along the closed orbits. To show the relation between the photodetachment cross section and the detached electron's classical closed orbits clearly, we make a Fourier transformation for the scaled photodetachment cross section of this system. Each peak in the Fourier transformed cross section corresponds to the scaled action of a closed orbit. We hope that our results will be useful in understanding the photodetachment process of negative ions in the vicinity of interfaces, cavities, and ion traps.