The collision frequency of electron-neutral-particle in weakly ionized plasmas with non-Maxwellian velocity distributions

Abstract

The collision frequencies of electron-neutral-particle in weakly ionized complex plasmas with the non-Maxwellian velocity distributions are studied. The average collision frequencies of electron-neutral-particle in plasmas are accurately derived. We find that these collision frequencies are significantly dependent on the power-law spectral indices of non-Maxwellian distribution functions and so they are generally different from the collision frequencies in plasmas with a Maxwellian velocity distribution, which will affect the transport properties of the charged particles in plasmas. Numerically analyses are made to show the roles of the spectral indices in the average collision frequencies respectively.

Collective effect of nonthermal and suprathermal particles on electrostatic waves and instabilities in Vasyliunas-Cairns distributed plasmas

“…Particularly in the long wavelength regime, the results for the Bernstein waves with the Vasyliunas-Cairns distribution significantly diverge from those previously obtained for the Maxwellian and dual kappa distributions [40]. Wang et al investigated collision frequencies of the electron-neutral particle using kappa-cairns velocity distribution [48]. Lee and Lim used the orbital angular momentum of an electric field to incorporate this nonthermal distribution into their kinetic theory [49].…”

Effects of suprathermal electrons on electron-acoustic instabilities

“…Although the kappa distribution has been widely used in the literature, the formation mechanism is still under discussion (Yoon, 2014;Livadiotis, 2019b;Guo, 2020;2021b). The suprathermal particles play an important role in affecting the physical properties of plasmas, such as the Debye length (Hatami et al, 2018;Livadiotis, 2019a), the transport coefficients (Wang and Du, 2018;Guo and Du, 2019;Husidic et al, 2021), and collision frequencies (Wang et al, 2021). A number of waves in kappa-distributed plasmas behave very differently from those in thermal equilibrium.…”

Effects of suprathermal electrons on electron-acoustic instabilities

“…The suprathermal particles play an important role in affecting the physical properties of plasmas, such as the Debye length (Hatami et al, 2018;Livadiotis, 2019a), the transport coefficients (Wang and Du, 2018;Guo and Du, 2019;Husidic et al, 2021), and collision frequencies (Wang et al, 2021). A number of waves in kappa-distributed plasmas behave very differently from those in thermal equilibrium.…”