Correspondence Between Quantum and Classical Dynamics inPhotodetachment Near Elastic Wall

The photodetachment of H? near an elastic wall was investigated and an analytical formula of the crosssection was derived. It was found that the cross section is a superposition of a smooth background and sinusoidal oscillation, which depends on the distance between the ion and the elastic wall. The classical dynamics of the photo-detached electron and its quantum correspondence was analyzed. In this model, the semiclassical photodetachment cross section is exactly the same as the quantum result.