Model for simulation of ion dynamics in a dense gas and strong electric fields

A model that allows to simulate the dynamics of ions in a dense gas and in strong electric fields is presented. The method is based on a combination of the directed motion of an ion in a dense gas with adding diffusion component. The mobility coefficient based on the frequency of ion-molecular collisions depending on ion velocities is used. Through this mobility coefficient a coefficient of diffusion is described. Comparison of the results of test calculations obtained with the help of the proposed method with the results obtained from the model taking into account individual ion-molecular collisions and a modified statistical diffusion model shows good accuracy of the method over a wide range of gas pressures and electric field strengths.