Arrival-time spectra (ATS) of an electron swarm in N₂ from 50 Td to 700 Td (1 Td = 10⁻¹⁷ Vcm²) were measured by double-shutter drift tube, and then the first Townsend ionization coefficient, mean-arrival-time drift velocity, longitudinal diffusion coefficient, and longitudinal third-order transport coefficient were obtained from the measured ATS. This is the first successful measurement of the third-order transport coefficient in a gas. Furthermore, we went back to an expression of the longitudinal diffusion coefficient in terms of the α parameter, which is the electron transport coefficient derived from ATS, and then demonstrated that the third-order and higher-order electron transport coefficients, which are traditionally ignored in the electron swarm experiment, should be considered to obtain the longitudinal diffusion coefficient properly at moderate and high reduced electric fields.

用双快门漂移管测量N ₂在50 Td至700 Td（1 Td = 10 ^-17 Vcm ²）中的电子群的到达时间谱（ATS），然后测量第一个Townsend电离系数，平均到达时空漂移速度，纵向扩散系数和纵向三阶输运系数是从测得的空中交通服务获得的。这是气体中三阶传输系数的首次成功测量。此外，我们回到了以α为单位的纵向扩散系数的表达式。 参数，这是从ATS得出的电子传输系数，然后证明应考虑考虑在电子群实验中传统忽略的三阶和更高阶电子传输系数，以在适当的温度下适当地获得纵向扩散系数和高减少的电场。