EFFECT OF THE ION-ATOM COLLISION ANISOTROPY ON THE ION-TRANSPORT FROMMONTE-CARLO SIMULATION

This paper is devoted to the determination of the differential and int egral collision cross sections needed for the calculation of the trans port coefficient of ions in weakly ionized gases. In the case of Ar+/A r system and for energy interval varying up to 100 eV, the cross secti ons are obtained from the interaction potential of polarization for lo w energies and of Lennard-Jones for higher energies. The calculation m ethod of the collision cross sections based on the classical mechanics has been first validated from comparisons of measured and calculated differential cross sections. Then, these cross sections have been used in a Monte-Carlo code for simulation of the transport of Ar+ ions in Ar gas at room temperature (300 K). The obtained transport coefficient s (ion mobility, drift velocity and diffusion coefficient) are in good agreement with the drift tube measurements given in the literature th us confirming the validity of the method of collision cross section ca lculation.