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弹性碰撞截面是研究粒子间相互作用的关键参数之一，有助于揭示气体绝缘的微观机理。本文基于R矩阵理论计算了24种气体分子在0~15 eV下的弹性碰撞截面，提取了最低共振态能量、峰值等截面特征参数。对比了SF6、CF2Cl2、i-C3F7CN碰撞截面的计算值与试验值，首次给出了i-C3F7CN在0~1 eV的低能碰撞截面；分析了F取代和碳链长度对截面参数的影响，最终研究了截面特征与绝缘强度间的关联性。结果表明，计算得到的各分子最低shape共振态能量与现有研究数据一致，均方误差为0.181；F取代时，共振态能量逐渐增大、峰值逐渐减小；碳链延长则与之相反。分子最低共振态能量、截面峰值与气体绝缘强度有较强关联，分子的最低共振态能量越低，对应的截面峰值越大，其绝缘强度越高。通过分析分子中低能弹性碰撞截面特征，可定性评估气体绝缘强度。The elastic collision cross-section is a key parameter in the study of inter-particle interactions, which helps to reveal the microscopic mechanism of gas insulation. For this reason, the elastic collision cross-sections of 24 gas molecules at 0-15 eV are calculated based on the R-matrix theory, and cross-section characteristic parameters of the lowest resonance state energy and its peak are extracted. Then the calculated and experimental values of SF6, CF2Cl2, and i-C3F7CN cross-sections are compared, and the low-energy cross-section data of i-C3F7CN at 0~1 eV are given for the first time. Furthermore the effects of Cl-substitution and carbon chain length on the cross-section parameters were analysed. Finally the correlation between cross-section characteristic parameters and insulation strength was investigated. The results show that the lowest shape resonance state energy for each molecule is in better agreement with the data from existing studies, with a mean square error of 0.181. F-substitution, the resonance energy gradually increases and the peak value gradually decreases; carbon chain extension is the opposite, the resonance state energy gradually decreases and the peak value gradually increases; The lowest resonance energy and peak value are strongly correlated with the insulation strength. The lower its lowest resonance energy and the larger the corresponding peak value, the higher the molecular insulation strength. Relevant data can theoretically complement existing experimental data. This study provides low energy cross-section properties of a wide range of insulating gas molecules, which can be useful for qualitatively evaluating the insulating properties of gas molecules, and thus for rapid screening of SF6 replacement gases.
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Keywords:
- Insulation strength /
- R-matrix method /
- cross-section /
- Resonances
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