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Chin. Phys. B, 2018, Vol. 27(7): 073203    DOI: 10.1088/1674-1056/27/7/073203

Above-threshold ionization of hydrogen atom in chirped laser fields

Yuan-Yuan Ni(倪园园)1, Song-Feng Zhao(赵松峰)1, Xiao-Yong Li(李小勇)2, Guo-Li Wang(王国利)1, Xiao-Xin Zhou(周效信)1
1 Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
2 Experimental Center, Northwest University for Nationalities, Lanzhou 730030, China
Abstract  Above-threshold ionization (ATI) of a hydrogen atom exposed to chirped laser fields is investigated theoretically by solving the time-dependent Schrödinger equation. By comparing the energy spectra, the two-dimensional momentum spectra, and the angular distributions of photoelectron for the laser pulses with different chirp rates, we show a very clear chirp dependence both in the multiphoton and tunneling ionization processes but no chirp dependence in the single-photon ionization. We find that the chirp dependence in the multiphoton ionization based ATI can be attributed to the excited bound states. In the single-photon and tunneling ionization regimes, the electron can be removed directly from the ground state and thus the excited states may not be very important. It indicates that the chirp dependence in the tunneling ionization based ATI processes is mainly due to the laser pulses with different chirp rates.
Keywords:  above-threshold ionization      chirped laser field      time-dependent Schrödinger equation  
Received:  12 March 2018      Revised:  13 April 2018      Accepted manuscript online: 
PACS:  32.80.Rm (Multiphoton ionization and excitation to highly excited states)  
  42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11664035, 11465016, 11764038, 11364038, and 11564033).
Corresponding Authors:  Song-Feng Zhao     E-mail:

Cite this article: 

Yuan-Yuan Ni(倪园园), Song-Feng Zhao(赵松峰), Xiao-Yong Li(李小勇), Guo-Li Wang(王国利), Xiao-Xin Zhou(周效信) Above-threshold ionization of hydrogen atom in chirped laser fields 2018 Chin. Phys. B 27 073203

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