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Angle-resolved spectra of the direct above-threshold ionization of diatomic molecule in IR+XUV laser fields |
| Shang Shi(石尚)1,3, Fa-Cheng Jin(金发成)2, Bing-Bing Wang(王兵兵)1 |
1 Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 Faculty of Science, Xi'an Aeronautical University, Xi'an 710077, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The direct above-threshold ionization (ATI) of diatomic molecules in linearly-polarized infrared and extreme ultraviolet (IR+XUV) laser fields is investigated by the frequency-domain theory based on the nonperturbative quantum electrodynamics. The destructive interference fringes on the angle-resolved ATI spectra, which are closely related to the molecular structure, can be well fitted by a simple predictive formula for any alignment of the molecular axis. By comparing the direct ATI spectra for monochromatic and two-color laser fields, we found that the XUV laser field can both raise the ionization probability and the kinetic energy of the ionized electron, while the infrared (IR) laser field can broaden the energy distribution of the ionized electron. Our results demonstrate that, by using IR+XUV two-color laser fields, the angle-resolved spectra of the direct ATI can image the structural information of molecules without considering the recollision process of the ionized electron.
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Received: 29 October 2018
Revised: 17 December 2018
Accepted manuscript online:
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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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33.15.Dj
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(Interatomic distances and angles)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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87.15.-v
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(Biomolecules: structure and physical properties)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11334009, 11425414, 11474348, and 11774411). |
Corresponding Authors:
Bing-Bing Wang
E-mail: wbb@aphy.iphy.ac.cn
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Cite this article:
Shang Shi(石尚), Fa-Cheng Jin(金发成), Bing-Bing Wang(王兵兵) Angle-resolved spectra of the direct above-threshold ionization of diatomic molecule in IR+XUV laser fields 2019 Chin. Phys. B 28 023202
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