| ATOMIC AND MOLECULAR PHYSICS |
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Identification of Above-Threshold Ionization by Imaging Photoelectrons from Ammonia Molecules in an Intense Femtosecond Laser Field |
| Qin Yang1,4, Jing Leng1,4, Yan-Hui Wang2, Ya-Nan Sun1,3, Hai-Bin Du5, Dong-Dong Zhang1,4, Le-Le Song1,6, Lan-Hai He1,4*, and Fu-Chun Liu1,4* |
1Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
2College of Electronic Science and Engineering, State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, China
3Department of Physics, No. 151 Middle School of Changchun, Changchun 130000, China
4Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China
5Department of Comprehensive, Harbin City Vocational College, Harbin 150000, China
6Jilin Institute of Chemical Technology, Jilin 132022, China
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| Cite this article: |
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Qin Yang, Jing Leng, Yan-Hui Wang et al 2022 Chin. Phys. Lett. 39 023301 |
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Abstract The above-threshold ionization process of ammonia molecules induced by a femtosecond laser field at 800 nm is studied in the intensity range from $1.6 \times 10^{13}$ to $5.7 \times 10^{13}$ W/cm$^{2}$. Channel switching under different laser intensities is observed and identified in the photoelectron kinetic energy spectra of ammonia. Based on the photoelectron kinetic energy distributions and the photoelectron angular distributions, the characteristic peaks observed are exclusively assigned to the multiphoton resonance through certain intermediate states, followed by multiphoton above-threshold ionization.
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Received: 01 December 2021
Published: 29 January 2022
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| PACS: |
33.80.Wz
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(Other multiphoton processes)
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33.60.+q
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(Photoelectron spectra )
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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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33.80.Rv
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(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
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