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The wide use of a speed-independent distance as a cutoff impact parameter together with Rutherford's scattering formula, within the cutoff theory, to account for charge screening in plasma environment embodies a clear inconsistency. A new physically justified choice of the cutoff distance is introduced and used to derive a closed form expression for the effective momentum transport cross section. A simple approximation for the present Coulomb logarithm, free of special functions, is also presented and assessed. A comparison with experimentally recovered data for the reduced Coulomb conductivity showed better agreement and better physical behavior of the present expressions compared with previous cutoff expressions in the literature.

On the Cutoff Distance and the Classical Energy-Averaged Electron–Ion Momentum Transport Cross Section in Ideal and Nonideal Plasmas