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The elastic collision cross-section is a key parameter in the study of inter-particle interactions, and it helps to reveal the microscopic mechanism of gas insulation. For this reason, based on the R -matrix theory, the elastic collision cross-sections of 24 gas molecules at 0–15 eV are calculated , 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. Furthermore the effects of Cl-substitution and carbon chain length on the cross-section parameters are analysed. Finally the correlation between cross-section characteristic parameters and insulation strength is investigated. The results show that the lowest shape resonance state energy for each molecule is in better agreement with the existing data within a mean square error of 0.181. For the F-substitution, the resonance energy gradually increases but the peak value gradually decreases, which the carbon chain extension is the opposite to: the resonance state energy gradually decreases but the peak value gradually increases. The lowest resonance energy and peak value are strongly related to the insulation strength. The lower its lowest resonance energy and the larger the corresponding peak value, the higher the molecular insulation strength is. The relevant data can theoretically supplement existing experimental data. This study provides low energy cross-section properties of various insulating gas molecules, which can be useful for qualitatively evaluating the insulating properties of gas molecules and quickly screening SF6 alternative gases.
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Keywords:
- insulation strength /
- R-matrix method /
- cross-section /
- resonances
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能量/eV 碰撞截面/
(10–16 cm2)能量/eV 碰撞截面/
(10–16 cm2)0.01 658.58 0.40 71.53 0.03 227.43 0.45 64.89 0.05 143.86 0.50 62.12 0.07 106.45 0.55 59.14 0.09 88.12 0.60 57.83 0.10 84.86 0.65 55.08 0.12 95.24 0.70 52.86 0.15 230.07 0.75 52.25 0.16 262.53 0.80 51.21 0.17 241.62 0.85 49.85 0.19 179.53 0.90 49.37 0.21 135.73 0.95 48.59 0.23 115.26 1.00 47.95 0.25 105.81 1.05 47.36 0.27 94.79 1.10 49.97 0.30 90.09 1.14 83.43 0.35 79.55 1.15 71.23 
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分子 最低共振态
位置/eV实验值或
计算值/eV峰值/
(10–16 cm2)Er 分子 最低共振态
位置/eV实验值或
计算值/eV峰值/
(10–16 cm2)Er CO2 3.33 3.14[49] 35.08 0.35 CF4 8.02 8.87[44] 27.67 0.41 N2 1.81 2.32[50] 65.81 0.38 C2F6 4.90 4.60[53] 39.10 0.78 CO 1.62 1.50[51] 73.01 0.40 C3F8 3.73 3.34[53] 51.50 0.98 BF3 3.46 3.88[52] 22.23 0.40 C4F10 2.81 2.37[53] 68.10 1.36 N2O 1.03 2.34[49] 100.21 0.47 C5F12 1.68 1.64[53] 76.69 1.75 SF6 0.72 0.85[42] 60.66 1.00 SO2 4.40 2.87[49] 19.88 1.00 i-C3F7CN 0.16 0.14[42] 262.53 2.20 CFCl3 0.20 0.26[42] 241.77 1.72 CF3Cl 1.65 2.00[44] 47.67 0.53 CF2Cl2 0.96 1.02[42] 63.59 1.10 CCl4 0.12 ~0.0[43] 306.07 2.36 CH3CN 2.73 2.82[47] 64.72 0.80 C2F5CN 0.69 1.40[54] 109.81 2.18 CH2Cl2 0.98 1.23[55] 81.98 0.60 CH3Cl 3.14 3.45[55] 33.96 0.31 CHCl3 0.33 0.35[55] 184.43 1.67 C2H2 2.65 2.60[56] 54.70 0.42 c-C4F8 0.55 0.45[57] 73.36 1.25
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