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Photodetachment of H- near an elastic surface in a magnetic field |
| Wang Lei(汪磊), Yang Hai-Feng(杨海峰), Liu Xiao-Jun(柳晓军), and Liu Hong-Ping(刘红平)† |
| State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China |
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Abstract This paper investigates the photodetachment of the negative hydrogen ion H- near an elastic wall in a magnetic field. The magnetic field confines the perpendicular motion of the electron, which results in a real three-dimensional well for the detached electron. The analytical formulas for the cross section of the photodetachment in the three-dimensional quantum well are derived based on both the quantum approach and closed-orbit theory. The magnetic field and the elastic surface lead to two completely different modulations to the cross section of the photodetachment. The oscillation amplitude depends on the strength of the magnetic field, the ion-wall distance and the photon polarization as well. Specially, for the circularly polarized photon-induced photodetachment, the cross sections display a suppressed (E–Eth)-1/2 threshold law with energy E in the vicinity above Landau energy Eth, contrasting with the (E–Eth)-1/2 threshold law in the presence of only the magnetic field. The semiclassical calculation fits the quantum result quite well, although there are still small deviations. The difference is attributed to the failure of semiclassical mechanics.
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Received: 06 August 2010
Revised: 07 September 2010
Accepted manuscript online:
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PACS:
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31.15.ag
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(Excitation energies and lifetimes; oscillator strengths)
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31.15.xg
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(Semiclassical methods)
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32.80.Gc
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(Photodetachment of atomic negative ions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10774162). |
Cite this article:
Wang Lei(汪磊), Yang Hai-Feng(杨海峰), Liu Xiao-Jun(柳晓军), and Liu Hong-Ping(刘红平) Photodetachment of H- near an elastic surface in a magnetic field 2011 Chin. Phys. B 20 033104
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