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Investigation on the influence of atomic potentials on the above threshold ionization

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Chinese Physics B 2014年第5期23卷 238-243页

作者：田原野李苏宇魏珊珊郭福明曾思良陈基根杨玉军 Institute of Atomic and Molecular Physics Jilin University Data Center for High Energy Density Physics Institute of Applied Physics and Computational Mathematics Science and Technology Computation Physics Laboratory Institute of Applied Physics and Computational Mathematics Department of Physics and Materials Engineering Taizhou University

We systematically investigate the influence of atomic potentials on the above-threshold ionization （ATI） spectra in one-dimensional （1D） cases and compare them with the three-dimensional （3D） case by numerically solving the time-dependent Schrrdinger equation. It is found that the direct ionization plateau and the rescattering plateau of the ATI spectrum in the 3D case can be well reproduced by the 1D ATI spectra calculated from the supersolid-core potential and the soft-core potential, respectively. By analyzing the factors that affect the yield of the ATI spectrum, we propose a modified-potential with which we can reproduce the overall 3D ATI spectrum. In addition, the influence of the incident laser intensities and frequencies on the ATI spectra calculated from the proposed modified potential is studied.

关键词： above threshold ionization model potential angular distribution of photoelectron

Probing time delay of strong-field resonant above-threshold ionization

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Chinese Physics B 2021年第1期30卷 215-220页

作者： Shengliang Xu Qingbin Zhang Cheng Ran Xiang Huang Wei Cao Peixiang Lu School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China

The high-resolution three-dimensional photoelectron momentum distributions via above-threshold ionization(ATI)of Xe atoms are measured in an intense near circularly polarized laser field using velocity map imaging and tomography reconstruction. Compared to the linearly polarized laser field, the employed near circularly polarized laser field imposes a more strict selection rule for the transition via resonant excitation, and therefore we can selectively enhance the resonant ATI through certain atomic Rydberg states. Our results show the self-reference ionization delay, which is determined from the difference between the measured streaking angles for nonadiabatic ATI via the 4 f and 5 f Rydberg states, is 45.6 as. Our method provides an accessible route to highlight the role of resonant transition between selected states, which will pave the way for fully understanding the ionization dynamics toward manipulating electron motion as well as reaction in an ultrafast time scale.

关键词： above threshold ionization resonant ionization delay transition selection rule

Simultaneous study of the lower order harmonic and photoelectron emission from an atom in intense laser pulse

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Chinese Physics B 2018年第8期27卷 219-223页

作者： Yan Yan Fu-Ming Guo Jun Wang Ji-Gen Chen Yu-Jun Yang Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy（Jilin University） Changchun 130012China Department of Physics and Materials Engineering Taizhou UniversityTaizhou 318000China

We simultaneously investigate variations of a low order harmonic and photoelectron emission with an incident laser intensity by solving the time-dependent Schr6dinger equation in a momentum space. It can be found that, the intensity of low order harmonic and photoelectron are gradually enhanced with the increase of the laser intensity, when the laser frequency is not in resonance with the transition frequency between the laser-induced high excited states and the ground state. If the resonance occurs, the intensity of the lower order harmonic is reduced and the interference can be observed in the lower order photoelectron spectra.

关键词： high-order harmonic generation above threshold ionization

Low-energy structure in the ionization of argon:Comparison of experiment with theory

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Chinese Physics B 2013年第2期22卷 204-207页

作者：冯立强楚天舒王利 State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences Institute for Computational Sciences and Engineering Laboratory of New Fiber Materials and Modern Textiles the Growing Base for State Key LaboratoryQingdao University

The above-threshold ionization of argon in an intense 70-fs,400-nm linearly polarized laser pulse has been investigated by the velocity map imaging techniques,combined with an attosecond-resolution quantum wave packet dynamics *** is a quantitative agreement in all dominant features between the experiment and the ***,a peak-splitting phenomenon in the first energy peak has been observed at high pulse ***,through the theoretical analysis,an ac Stark splitting with evident resonant and nonresonant ionization pathways has been found to be the physical reason for the experimental observations.

关键词： above threshold ionization angular distribution Stark splitting

Interpulse interference of electron emission from an atom irradiated by sinusoidally phase-modulated pulse

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Chinese Physics B 2018年第10期27卷 283-287页

作者： Hai-Ying Yuan Fu-Ming Guo Di-Yu Zhang Jun Wang Ji-Gen Chen Yu-Jun Yang Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy (Jilin University) Changchun 130012 China Department of Physics and Materials Engineering Taizhou University Taizhou 318000 China

We theoretically investigate the photoelectron emission from an atom irradiated by an amplitude modulated sinusoidally phase-modulated pulse through solving the time-dependent Schr¨odinger equation in the momentum space. By controlling the phase amplitude of the pulse in the frequency domain, it can be found that the photoelectron spectra appear as explicit interference phenomena, which originated from the interference between the directly ionized electron and the ionization of the pre-excited atom from different subpulses.

关键词： high-order harmonic generation above threshold ionization