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Role of excited states in helium-like ions on high-order harmonic generation |
| Jiang-Hua Luo(罗江华)† and Jia-Jun Xiao(肖佳俊) |
| School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China |
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Abstract We theoretically investigate high-order harmonic generation (HHG) of helium (He), lithium cation (Li+), and beryllium dication (Be2+) using the time-dependent Hartree-Fock method to solve the three-dimensional time-dependent Schrödinger equation. It is found that the intensity of the HHG increases significantly from a certain harmonic order below the ionization threshold, and the initial position of the enhancement does not depend on the intensity or the wavelength of the driving laser field. Further analysis shows that excited states play an important role on this enhancement, consistent with the excited-state tunneling mechanism [Phys. Rev. Lett. 116 123901 (2016)]. Our results unambiguously show that excited-state tunneling is essential for understanding the enhancement of HHG. Accordingly, a four-step model is herein proposed to illustrate the multiphoton excitation effect in helium-like ions, which enriches the physics of HHG enhancement.
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Received: 10 May 2023
Revised: 22 June 2023
Accepted manuscript online: 30 June 2023
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PACS:
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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31.90.+s
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(Other topics in the theory of the electronic structure of atoms and molecules)
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32.80.Fb
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(Photoionization of atoms and ions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12274294 and 12075036). |
Corresponding Authors:
Jiang-Hua Luo
E-mail: jhluo09@qq.com
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Cite this article:
Jiang-Hua Luo(罗江华) and Jia-Jun Xiao(肖佳俊) Role of excited states in helium-like ions on high-order harmonic generation 2023 Chin. Phys. B 32 113201
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