Modelling of collisions and scattering of particles in electromagnetic fields using TLM

A field-particle model has been developed which models the movement of char ged particles through a gas under the influence of an electromagnetic field . The operation of the model is illustrated by modelling scattering, ionisa tion and charge build-up in molecular hydrogen gas at low pressure. Simulat ion results obtained using typical experimental data give very reasonable a greement with measurements of drift velocity, diffusion coefficients and To wnsend's first coefficient.