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Special Issue:
SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems
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| SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems |
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Isotopic effects in two-body fragmentation process of water dications induced by electron-impact ionization |
| Xiaorui Xue(薛晓睿), Jiaqi Zhou(周家琪)†, Xintai Hao(郝鑫泰), Lei Wang(王磊), Peng Li(李鹏), Qibo Ma(马启博), and Xueguang Ren(任雪光)‡ |
| Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China |
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Abstract The two-body fragmentation dynamics of water isotopologues dications ($\rm{{H_2O}^{2+}}$, $\rm{{HOD}^{2+}}$, and $\rm{{D_2O}^{2+}}$) induced by 200 eV electron impact is investigated. Two fragment ions and an emitted electron are detected in coincidence, and their momentum vectors are determined by employing a reaction microscope. The complete kinematical information of four two-body fragmentation channels of $\rm {H}^{+} + \rm {OH}^{+}$, $\rm {H}^{+} + \rm {OD}^{+}$, $\rm {D}^{+} + \rm {OH}^{+}$, and $\rm {D}^{+} + \rm {OD}^{+}$ is obtained. By analyzing the projectile energy-loss spectrum, the initial electronic state of the two-body dissociation channel is determined. Upon examining the kinetic energy release (KER) distributions of the four fragmentation channels, a clear difference is found between the two-body fragmentation channel $\rm {H}^{+} + \rm {OD}^{+}$ and the other three channels. The isotopic effect in the two-body fragmentation is demonstrated by the analysis of the relative yields of the two-body fragmentation channels originating from different isotopologues, which shows preferential cleavage of the O-H bond over the O-D bond. These results provide deeper insight into the microscopic dynamic mechanisms in water radiolysis.
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Received: 28 February 2025
Revised: 19 April 2025
Accepted manuscript online: 07 May 2025
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PACS:
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34.50.Bw
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(Energy loss and stopping power)
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31.15.xv
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(Molecular dynamics and other numerical methods)
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32.10.Bi
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(Atomic masses, mass spectra, abundances, and isotopes)
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07.77.Gx
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(Atomic and molecular beam sources and detectors)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12325406, 92261201, 12404305, and 11974272), the Shannxi Province Natural Science Fundamental Research Project (Grant Nos. 2023JC-XJ-03 and 23JSQ013), and the Fundamental Research Funds for the Central Universities (Grant No. xzy022024040). |
Corresponding Authors:
Jiaqi Zhou, Xueguang Ren
E-mail: zhoujiaqi@xjtu.edu.cn;renxueguang@xjtu.edu.cn
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Cite this article:
Xiaorui Xue(薛晓睿), Jiaqi Zhou(周家琪), Xintai Hao(郝鑫泰), Lei Wang(王磊), Peng Li(李鹏), Qibo Ma(马启博), and Xueguang Ren(任雪光) Isotopic effects in two-body fragmentation process of water dications induced by electron-impact ionization 2025 Chin. Phys. B 34 073401
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