中国物理B ›› 2007, Vol. 16 ›› Issue (9): 2644-2649.doi: 10.1088/1009-1963/16/9/025

• GENERAL • 上一篇    下一篇

Bifurcation phenomena of photodetached electron flux in parallel external fields

高嵩1, 李洪云1, 林圣路1, 杨光参2   

  1. (1)College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; (2)School of Physics and Electronic Information, Wenzhou University, Wenzhou 325027, China
  • 收稿日期:2006-02-24 修回日期:2007-03-19 出版日期:2007-09-20 发布日期:2007-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374061 and 90403028).

Bifurcation phenomena of photodetached electron flux in parallel external fields

Gao Song(高嵩)a), Li Hong-Yun(李洪云)a), Yang Guang-Can(杨光参)b), and Lin Sheng-Lu(林圣路)a)†   

  1. a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; b School of Physics and Electronic Information, Wenzhou University, Wenzhou 325027, China
  • Received:2006-02-24 Revised:2007-03-19 Online:2007-09-20 Published:2007-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374061 and 90403028).

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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.

Abstract: 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.

Key words: photodetached electron flux, bifurcation of classical orbits, fold caustic, semiclassical uniform approximation

中图分类号:  (Semiclassical methods)

  • 31.15.xg
32.80.Gc (Photodetachment of atomic negative ions)