Examination of Longitudinal Diffusion Coefficient Obtained by Pulse Experiment

Abstract

Pulsed experiment is simulated by Monte Carlo simulation for two kinds of constant collision frequency model gases, and longitudinal diffusion coefficient D_L', which is measured in “Pulse experiment”, is deduced. D_L' is compared with the diffusion coefficient D_L, obtained by the simulation of Time-of-Flight experiment. It is found that D_L' does not necessarily agree with D_L, and that the difference between D_L' and D_L tends to increase when the values of E/N and effective ionisation coefficient increase.