Photodetachment of H− near Elastic Surface inParallel Electric and Magnetic Fields

Abstract

The photodetachment cross section of H− in parallel electric andmagnetic fields near an elastic surface is derived and calculated byusing the closed orbit theory. It is found that the elastic surface canproduce some interesting effects. Besides the closed orbits previouslyfound by Peters et al. for the H− in parallel electric andmagnetic fields, some additional closed orbits are produced due to theeffect of the elastic surface. The results show that the cross sectionoscillation is much more complicated in comparison with the crosssection of H− in parallel external fields without surface. Eachpeak in the Fourier transformed cross section corresponds to the periodof one detached electron closed orbit. This study provides a newunderstanding of the photodetachment of negative ions in the presenceof external fields and surface.