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
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.
Korneev P A, Popruzhenko S V, Goreslavski S P, Yan T M, Bauer D, Becker W, Kübel M, Kling M F, Rödel C, Wünsche M and Paulus G G 2012 Phys. Rev. Lett.108 223601
2017, Vol. 34 
