Laser-assisted XUV double ionization of helium atoms: Intensity dependence of joint angular distributions

doi:10.1088/1674-1056/ab90ef

Abstract We investigate the intensity effect of ultrashort assisting infrared laser pulse on the single-XUV-photon double ionization of helium atoms by solving full six-dimensional time-dependent Schrödinger equation with implement of finite element discrete variable representation. The studies of joint energy distributions and joint angular distributions of the two photoelectrons reveal the competition for ionized probabilities between the photoelectrons with odd parity and photoelectrons with even parity in single-XUV-photon double ionization process in the presence of weak infrared laser field, and such a competition can be modulated by changing the intensity of the weak assisting-IR laser pulses. The emission angles of the two photoelectrons can be adjusted by changing the laser parameters as well. We depict how the assisting-IR laser field enhances and/or enables the back-to-back and side-by-side emission of photoelectrons created in double ionization process.

Keywords: laser-assisted double photoionization helium atom angular distribution

Received: 21 March 2020
Revised: 28 April 2020
Accepted manuscript online:

PACS:	32.80.-t	(Photoionization and excitation)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)
	87.64.mn	(Multiphoton)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774131 and 91850114).

Corresponding Authors: Aihua Liu
E-mail: aihualiu@jlu.edu.cn

Cite this article:

Fengzheng Zhu(朱风筝), Genliang Li(黎根亮), Aihua Liu(刘爱华) Laser-assisted XUV double ionization of helium atoms: Intensity dependence of joint angular distributions 2020 Chin. Phys. B 29 073202

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Laser-assisted XUV double ionization of helium atoms: Intensity dependence of joint angular distributions

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