Isotopic effects in two-body fragmentation process of water dications induced by electron-impact ionization

doi:10.1088/1674-1056/add4fd

中国物理B ›› 2025, Vol. 34 ›› Issue (7): 73401-073401.doi: 10.1088/1674-1056/add4fd

所属专题： SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems

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

收稿日期:2025-02-28 修回日期:2025-04-19 接受日期:2025-05-07 出版日期:2025-06-18 发布日期:2025-06-18
通讯作者: Jiaqi Zhou, Xueguang Ren E-mail:zhoujiaqi@xjtu.edu.cn;renxueguang@xjtu.edu.cn
基金资助:
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).

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

Received:2025-02-28 Revised:2025-04-19 Accepted:2025-05-07 Online:2025-06-18 Published:2025-06-18
Contact: Jiaqi Zhou, Xueguang Ren E-mail:zhoujiaqi@xjtu.edu.cn;renxueguang@xjtu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: isotopic effect, two-body fragmentation dynamics, kinetic energy release

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.

Key words: isotopic effect, two-body fragmentation dynamics, kinetic energy release

中图分类号: (Energy loss and stopping power)

34.50.Bw

31.15.xv (Molecular dynamics and other numerical methods) 32.10.Bi (Atomic masses, mass spectra, abundances, and isotopes) 07.77.Gx (Atomic and molecular beam sources and detectors)

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[J]. 中国物理B, 2025, 34(7): 73401-073401.

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Isotopic effects in two-body fragmentation process of water dications induced by electron-impact ionization

Isotopic effects in two-body fragmentation process of water dications induced by electron-impact ionization

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