TAN Xu; FANG Fan; ZHANG Yu; SUN Dehao; WU Yijiao; YIN Hao; MENG Tianming; TU Bingsheng; WEI Baoren

doi:10.7498/aps.74.20251099

Abstract

Investigating molecular fragmentation mechanisms and the kinetic energy distributions of fragments can offer crucial insights into their roles in plasma physics, radiation-induced damage in biological tissues, and interstellar chemistry. In this study, we conduct the experiments on collision between 3 keV/u ${\rm Ar}^{8+} $ ions and CH₃F molecules by using a cold target recoil ion momentum spectrometer (COLTRIMS).We focus on the three-body fragmentation channel H⁺+$ {\mathrm{C}\mathrm{H}}_{2}^{+} $+F⁺ resulting from C—F and C—H bond cleavage in CH₃F³⁺ ions, and measure the three-dimensional momentum vectors of all fragment ions. The fragmentation mechanism involved is analyzed using ion-ion kinetic energy correlation spectra, Newton diagrams, Dalitz plots, and other correlation spectra.Our results reveal two different dissociation mechanisms for the H⁺+$ {\mathrm{C}\mathrm{H}}_{2}^{+} $+F⁺ channel, i.e. concerted fragmentation and sequential fragmentation, with the former one being dominant. In the sequential fragmentation process, H⁺ and the intermediate CH₂F²⁺ are firstly formed, followed by further fragmentation of the intermediates into $ {\mathrm{C}\mathrm{H}}_{2}^{+} $ and F⁺. No sequential pathways involving HF²⁺ or $ {\mathrm{C}\mathrm{H}}_{3}^{2+} $ intermediates are identified. Furthermore, we observe two types of concerted fragmentation processes with different dynamical characteristics, suggesting that hydrogen atoms in CH₃F³⁺ may occupy different chemical environments. This phenomenon can originate from either molecular isomerization producing different structural geometries or the Jahn-Teller effect leading to inequivalent C—H bonds. This study reveals the three-body dissociation dynamics of CH₃F³⁺ induced by highly charged ion collisions, highlighting the significant role of the Jahn-Teller effect or molecular isomerization in the ionic dissociation of polyatomic molecules.

Keywords:

fluoromethane /
dissociative ionization /
three-body fragmentation /
cold target recoil ion momentum spectrometer

Authors and contacts

Corresponding author: ZHANG Yu, zyclay@outlook.com ; WEI Baoren, brwei@fudan.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 12374227, 12104185), the National Key R&D Program of China (Grant No. 2022YFA1602504), and the Young Sci-Tech Talent Special Program of Jiaxing, China (Grant No. 2024AY40007).

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[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]
[28]
[29]
[30]
[31]
[32]
[33]
[34]
[35]
[36]
[37]
[38]
[39]
[40]
[41]
[42]
[43]
[44]
[45]
[46]

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[21]
[22]
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Vol. 74, Issue 21 - 2025-11-05

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