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The results of Monte Carlo calculations of the ion drift characteristics in a constant and homogeneous electricfield are presented for the values of the applied intensity in the range 1 <E / N <1000 Td for cesium, rubidiumand mercury. The results of molecular dynamics simulation are used together with the Monte Carlo method forcalculation of collisional characteristics. The drift velocity, mean kinetic energy, longitudinal and transversediffusion coefficients, mean free path, and the fraction of collisions with backward scattering are calculated. Itis shown that the introduction of dimensionless units makes it possible to reduce the characteristics for differentgases to universal curves. And the Bhatnagar, Gross, and Krook collision integral for the problem of ion drift inan own gas leads to significant errors. Also, an unexpected and nontrivial fact about the collisions with backwardscattering is obtained and conclusions provided. It is found that using the BGK collision integral foedeseviling of ion drift an own gas leads to significant errors. There are some discussions regarding the largedifference between present calculations and data of the BGK theory.

Ion drift in parent gas for cesium, rubidium, and mercury