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The research on the correlation between the insulation strength and microscopic parameter of gas medium is beneficial to improve the development efficiency of SF6 alternative gas. In this paper, based on density functional theory, the M06-2X functional and def2 series basis sets were used to establish the stable structures of 73 kinds of gas molecules. The Fukui function parameters that characterize the electron probability density difference were calculated, its correlation with insulation strength was analyzed, and the corresponding prediction model was established. The results show that the electrophilic index, local reduced electrophilic index minimum, local reduced nucleophilic index minimum, molecular volume, local surface electrophilic index maximum, local surface nucleophilic minimum have strong correlation with insulation strength. When the electron probability density in the prediction model is 0.000 05 a.u., the maximum determination coefficient is 0.812, and the mean square error is 0.094.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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