See for example, E. W. McDaniel and E. A. Mason: The Mobility and Diffusion of Ions in Gases (John Wiley and Sons, New York, 1973) Chap. 7.
Y. Kaneko, T. Koizumi and N. Kobayashi: J. Phys. Soc. Japan 40 (1976) 605. D. R. James, E. Graham, G. R. Akridge and E. W. McDaniel: J. chem. Phys. 63 (1975) 740. N. Takata: Phys. Rev. A14 (1976) 114. Y. Kaneko, N. Kobayashi and I. Kanomata: J. Phys. Soc. Japan 27 (1969) 992. S. K. Allison and M. Kamegai: Rev. sci. Instrum. 32 (1961) 1090.
N. Takata: Phys. Rev. A10 (1974) 2336. G. H. Wannier: The Bell System Tech. J. 32 (1953) 170, Eq. (122).
Y. Kaneko, L. R. Megill and J. B. Hasted: J. chem. Phys. 45 (1966) 3741, Eq. (6). H. R. Skullerud: J. Phys. B (Atom. Mol. Phys.) 6 (1973) 728.