Photodetachment of a Hydrogen Negative Ion inside an Annular Nano-Microcavity

Abstract

The photodetachment of a hydrogen negative ion inside an annular nano-microcavity is studied based on the semiclassical closed orbit theory. The closed orbit of the photo-detached electron in an annular nano-microcavity is investigated and the total photodetachment cross section of this system is calculated. The calculation results suggest that the oscillatory structure in the photodetachment cross section depends on the shape of the microcavity sensitively. If the outer radius R of the annular microcavity is given, with an increase of the inner radius Rin, the number of the closed orbits increased correspondingly and the oscillating amplitude in the photodetachment cross section becomes larger. In order to show the correspondence between the cross section and the detached electron's closed orbits clearly, we calculate the Fourier transformation of the cross section and find that each peak corresponds to the length of one closed orbit. We hope that our results will be useful in understanding the photodetachment or the transport and escape process of negative ions in a microcavity.