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Magnetic field effect in photodetachment from negative ion in electric field near metal surface

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O441.1[理学—电磁学;理学—物理] TG178[金属学及工艺—金属表面处理;金属学及工艺—金属学]
作者机构：[1]College of Physics, Ludong University, Yantai 264025, China
相关基金：Project supported by the National Natural Science Foundation of China （Grant Nos. 11074104 and 10604045） and the University Science and Technology Planning Program of Shandong Province of China （Grant No. J09LA02）.

关键词：金属表面, 磁场效应, 电场强度, 负离子, 光致, 闭合轨道理论, 磁场强度, 闭轨道, photodetachment, closed-orbit theory, magnetic field effect, metal surface

中文摘要：

Based on the closed-orbit theory, the magnetic field effect in the photodetachment of negative ion in the electric field near a metal surface is studied for the first time. The results show that the magnetic field can produce a significant effect on the photodetachment of negative ion near a metal surface. Besides the closed orbits previously found by Du et al. for the H in the electric field near a metal surface (J. Phys. B 43 035002 (2010)), some additional closed orbits are produced due to the effect of magnetic field. For a given ion-surface distance and an electric field strength, the cross section depends sensitively on the magnetic field strength. As the magnetic field strength is very small, its influence can be neglected. With the increase of the magnetic field strength, the number of the closed orbits increases greatly and the oscillation in the cross section becomes much more complex. Therefore we can control the photodetachment cross section of the negative ion by changing the magnetic field strength. We hope that our results may guide future experimental studies for the photodetachment process of negative ion in the presence of external fields and surfaces.

英文摘要：

Based on the closed-orbit theory, the magnetic field effect in the photodetachment of negative ion in the electric field near a metal surface is studied for the first time. The results show that the magnetic field can produce a significant effect on the photodetachment of negative ion near a metal surface. Besides the closed orbits previously found by Duet al. for the H in the electric field near a metal surface （J. Phys. B 43 035002 （2010））, some additional closed orbits are produced due to the effect of magnetic field. For a given ion surface distance and an electric field strength, the cross section depends sensitively on the magnetic field strength. As the magnetic field strength is very small, its influence can be neglected. With the increase of the magnetic field strength, the number of the closed orbits increases greatly and the oscillation in the cross section becomes much more complex. Therefore we can control the photodetachment cross section of the negative ion by changing the magnetic field strength. We hope that our results may guide future experimental studies for the photodetachment process of negative ion in the presence of external fields and surfaces.

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