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Imprint of transient electron localization in H2+ using circularly-polarized laser pulse |
| Jianghua Luo(罗江华)1,2,†, Jun Li(李军)1, and Huafeng Zhang(张华峰)1 |
| 1 School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China; 2 National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China |
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Abstract Photoelectron momentum distribution of hydrogen molecular ion in a circularly polarized laser pulse is calculated by solving the three-dimensional time-dependent Schrödinger equation (3D-TDSE). At the intermediate internuclear distance, an unusual multi-peak structure is observed in the angular distribution, which is proved to be a signature of the transient localization of the electron upon alternating nucleus. By tracing the time-dependent ionization rate and bound state populations, we provide a clear evidence that the transient electron localization still exists in circularly polarized pulse and the corresponding multiple ionization bursts are directly mapped onto observable angular distributions. In addition, we introduce an intuitive strong-field approximation model which incorporates laser-induced subcycle internal electron dynamics to isolate the effect of the Coulomb potential of the parent ions. In this way, the timing of each ionization burst can be directly read out from the angular distributions. Our results suggest that the ionization time serves as a sensitive tool encoding intramolecular electron dynamics and can be measured using attoclock technique.
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Received: 31 July 2020
Revised: 14 September 2020
Accepted manuscript online: 28 September 2020
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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 Key Research and Development Program of China (Grant No. 2018YFB1801904), the National Natural Science Foundation of China (Grant No. 12075036), and the Open Research Fund of National Mobile Communications Research Laboratory, Southeast University (Grant No. 2019D14). |
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Corresponding Authors:
†Corresponding author. E-mail: jhluo09@qq.com
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Cite this article:
Jianghua Luo(罗江华), Jun Li(李军), and Huafeng Zhang(张华峰) Imprint of transient electron localization in H2+ using circularly-polarized laser pulse 2020 Chin. Phys. B 29 123201
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