1 School of Physics, Liaoning University, Shengyang 110036, China; 2 Department of Physics, Shenyang Aerospace University, Shengyang 110003, China; 3 School of Physics Science and Technology, Inner Mongolia University, Hohhot 010021, China
Abstract This paper proposes a modified strong field approximation model for evaluating nondipole effects on the ionization of an atom in an intense laser field. The photoelectron longitudinal momentum distributions (PLMD) of a hydrogen-like atom exposed to a mid-infrared laser field is calculated. The theoretical results indicate an obvious asymmetry in the PLMD, and an offset of the PLMD peak appears in the opposite direction of the beam propagation due to nondipole effects. The peak offsets of the PLMD increased with the laser intensity, imposed by the initial state of the hydrogen-like atom.
(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11274149) and the Program of Shenyang Key Laboratory of Optoelectronic Materials and Technology, China (Grant No. F12-254-1-00).
Corresponding Authors:
Yi-Ning Huo, Feng-Cai Ma
E-mail: huoyining_jiangnan@126.com;fcma@lnu.edu.cn
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