Electron Impact Cross Sections and Transport Studies of C₃F₆O

Electron impact scattering from C3F6O is studied in this work. The R-matrix method was used for the calculations of elastic, momentum transfer, and excitation cross sections. The attachment cross section was obtained through a parametric estimator based on the R-matrix outputs. The Binary-Encounter-Bethe (BEB) method was used for computing the ionization cross section. The obtained cross section set was used for the transport studies using the BOLSIG+ code, which isa two-term Boltzmann equation solver. The present calculation was performed for steady-stateTownsend experimental conditions for E/N, covering a range of 100-1000 Td. The critical dielectric strength of pure C3F6O was found to be 475 Td, which is much greater than that of SF6(355 Td). The effect of the addition of different buffer gases, such as CO2, N-2, and O-2, was also examined. For the C3F6O-CO2, C3F6O-N-2, and C3F6O-O2mixtures with 65%, 55%, and 60% C3F6O, respectively, the critical dielectric strength was determined to be essentially the same as that of pure SF6. The presence of synergism was confirmed for these gas mixtures. We further derived the Paschen curve using a fitting method with the transport parameters as the basic inputs. The minimum breakdown voltageof C3F6O accounted for only 55% of that of SF6. The buffer gas mixture improved the condition;however, the performance of CO(2 )and O(2 )mixtures was not satisfactory. The addition of N2 as thebuffer gas significantly improved the breakdown property of the gas. The mixture of >= 99% of N(2)or <= 1% of C3F6O gave a better breakdown characteristic than SF6. Any proportion >= 90% of N2or <= 10% of C3F6O was suitable in the higher pressure ranges. The present work demonstrates the potential of C3F6O as a substitute gas for SF(6)with a negligible environmental threat