Above-threshold ionization of hydrogen atom in chirped laser fields

doi:10.1088/1674-1056/27/7/073203

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: zhaosf@nwnu.edu.cn

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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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