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The Coulomb effect on a low-energy structure in above-threshold ionization spectra induced by mid-infrared laser pulses |
| Lin Zhi-Yang (林志阳)a e, Wu Ming-Yan (吴明艳)a e, Quan Wei (全威)a, Liu Xiao-Jun (柳晓军)a, Chen Jing (陈京)b c, Cheng Ya (程亚)d |
a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
b HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China;
c Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
d State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
e University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract We investigate the low-energy structure (LES) in the above-threshold ionization spectrum at a mid-infrared laser wavelength with a semiclassical model. Using a softened Coulomb potential (CP) and changing the softening parameter, we show that though the very low-energy structure (VLES) and high low-energy structure (HLES) are both due to the interaction between the ionic CP and the electron, the two structures have different physical mechanisms: the VLES can be attributed to the electron–ion Coulomb interaction at a rather small distance and the HLES is more likely to be ascribed to the electron–ion Coulomb interaction at a large distance.
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Received: 16 April 2013
Revised: 07 May 2013
Accepted manuscript online:
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PACS:
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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32.80.Wr
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(Other multiphoton processes)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10925420, 11074026, 11174330, and 11274050) and the National Basic Research Program of China (Grant Nos. 2011CB808102 and 2013CB922201). |
Corresponding Authors:
Liu Xiao-Jun, Chen Jing
E-mail: xjliu@wipm.ac.cn;chen_jing@iapcm.ac.cn
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| About author: 32.80.Rm; 42.50.Hz; 32.80.Wr |
Cite this article:
Lin Zhi-Yang (林志阳), Wu Ming-Yan (吴明艳), Quan Wei (全威), Liu Xiao-Jun (柳晓军), Chen Jing (陈京), Cheng Ya (程亚) The Coulomb effect on a low-energy structure in above-threshold ionization spectra induced by mid-infrared laser pulses 2014 Chin. Phys. B 23 023201
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