| ATOMIC AND MOLECULAR PHYSICS |
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Role of XUV Photons in Atomic High-Order Above-Threshold Ionization Processes in IR+XUV Two-Color Laser Fields |
| Kui Zhang1, Min Liu1, Bing-Bing Wang1**, Ying-Chun Guo2, Zong-Chao Yan3,4,5, Jing Chen6,7**, Xiao-Jun Liu4** |
1Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Department of Physics, East China Normal University, Shanghai 200241
3Department of Physics, University of New Brunswick, Fredericton, New Brunswick, Canada
4State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
5Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071
6HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871
7Institute of Applied Physics and Computational Mathematics, Beijing 100088
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| Cite this article: |
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Kui Zhang, Min Liu, Bing-Bing Wang et al 2017 Chin. Phys. Lett. 34 113201 |
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Abstract We investigate the above-threshold ionization of an atom in a combined infrared (IR) and extreme ultraviolet (XUV) two-color laser field and focus on the role of XUV field in the high-order above-threshold ionization (HATI) process. It is demonstrated that, in stark contrast to previous studies, the XUV laser may play a significant role in atomic HATI process, and in particular, the XUV laser can accelerate the ionized electron in a quantized way during the collision between the electron and its parent ion. This process cannot be explained by the classical three-step model. Our results indicate that the previously well-established concept that HATI is an elastic recollision process is broken down.
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Received: 29 September 2017
Published: 25 October 2017
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| PACS: |
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.Fb
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(Photoionization of atoms and ions)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11474348, 61275128, 11274050, 11334009 and 11425414, the NSERC of Canada, the Canadian Computing Facilities of SHARCnet and ACEnet, and the National Basic Research Program of China under Grant No 2013CB922200. |
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