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Chin. Phys. B, 2026, Vol. 35(4): 043301    DOI: 10.1088/1674-1056/ae3608
SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems Prev   Next  

Intensity-dependent control of dissociation pathways in strong-field double ionization of ethylene

Jianting Lei(雷建廷)1,2,†, Luqi Li(李潞琪)1,5,†, Xiangjie Chen(陈祥杰)1, Chenyu Tao(陶琛玉)2,3, Shuncheng Yan(闫顺成)2,3, Qingcao Liu(刘情操)1,‡, and Shaofeng Zhang(张少锋)2,3,4,§
1 College of Science, Harbin Institute of Technology, Weihai 264209, China;
2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China;
4 State Key Laboratory of Heavy Ion Science and Technology, Lanzhou 730000, China;
5 School of Physics, Harbin Institute of Technology, Harbin 150001, China
Abstract  We investigate the dissociation dynamics of ethylene (C$_{2}$H$_{4}$) in strong femtosecond laser fields using a reaction microscope. Coincidence ion detection enables reconstruction of fragment momenta and identification of multiple two-body channels of C$_{2}$H$_{4}^{2+}$, including C$_{2}$H$_{3}^{+} + {\rm H}^{+}$, CH$_{2}^{+} + {\rm CH}_{2}^{+}$, and C$_{2}$H$_{2}^{+} + {\rm H}_{2}^{+}$. Particular attention is given to the symmetric CH$_{2}^{+} + {\rm CH}_{2}^{+}$ channel. With increasing laser intensity, the kinetic energy release peak shifts from 5.2 eV to 7.3 eV, indicating a transition from dissociation via lower excited states (e.g., $^{3}$B$_{\rm 3u}$ and $^{1}$A$_{\rm u}$ (S$_{2}$)) to higher-lying states (e.g., $^{3}$Ag and $^{1}$B$_{\rm 3g}$). The observed evolution of state populations highlights that peak laser power density governs the selection of dissociation pathways. By tuning laser parameters, specific channels can be enhanced or suppressed, providing an effective approach for steering molecular fragmentation dynamics in polyatomic systems.
Keywords:  coincidence measurement      kinetic energy release (KER)      Coulomb explosion  
Received:  11 November 2025      Revised:  07 January 2026      Accepted manuscript online:  09 January 2026
PACS:  33.80.-b (Photon interactions with molecules)  
  33.80.Rv (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))  
  34.50.-s (Scattering of atoms and molecules)  
  34.50.Lf (Chemical reactions)  
  07.77.-n (Atomic, molecular, and charged-particle sources and detectors)  
Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12304376, 12504397, and 12204132), the Shandong Provincial Natural Science Foundation (Grant Nos. ZR2025QC1459, TSQN202408113, and ZR2023QA075), and the National Key Research and Development Program of China (Grant No. 2022YFA1602500).
Corresponding Authors:  Qingcao Liu, Shaofeng Zhang     E-mail:  qingcao.liu@hit.edu.cn;zhangshf@impcas.ac.cn

Cite this article: 

Jianting Lei(雷建廷), Luqi Li(李潞琪), Xiangjie Chen(陈祥杰), Chenyu Tao(陶琛玉), Shuncheng Yan(闫顺成), Qingcao Liu(刘情操), and Shaofeng Zhang(张少锋) Intensity-dependent control of dissociation pathways in strong-field double ionization of ethylene 2026 Chin. Phys. B 35 043301

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