Bifurcation phenomena of photodetached electron flux in parallel external fields

• 来源期刊: 中国物理（英文版）
• 关键词: photodetached electron flux bifurcation of classical orbits fold caustic semiclassical uniform approximation
• 年，卷（期）: 2007,（9）
• 页码范围: 2644-2649
• 页数: 6页
• 语种: 英文

摘要

A semiclassical method based on the closed-orbit theory is applied to analysing the dynamics of photodetached electron of H- in the parallel electric and magnetic fields. By simply varying the magnetic field we reveal spatial bifurcations of electron orbits at a fixed emission energy, which is referred to as the fold caustic in classical motion. The quantum manifestations of these singularities display a series of intermittent divergences in electronic flux distributions.We introduce semiclassical uniform approximation to repair the electron wavefunctions locally in a mixed phase space and obtain reasonable results. The approximation provides a better treatment of the problem.