Spatial growth of ionization currents has been measured in CCl2F2/N2 mixtures by the steady‐state Townsend method over the range of reduced fields 80 ≤E/p20≤180 V cm−1 Torr−1. The experimental values obtained differ markedly from those published in the literature. A detailed account of the various hypotheses used in the experiment is presented in the light of correspondence with the electron transport theory and is followed by a comparison of experimental data, i.e., limit fields (E/p20)∗, ionization (α), attachment (η), and effective ionization (α) coefficients, with available theoretical values from Boltzmann‐equation analysis of electron swarms in the pure gas and its mixture with N2. Good agreement with the theoretical calculations by J. P. Novak and M. F. Fréchette [J. Appl. Phys. 57, 4368 (1985)] provides further supporting evidence for the applicability of these authors’ proposed set of electron scattering cross sections and, in particular, favors the attachment cross sections reported by E. Illenberger, H.‐U. Scheunemann, and H. Baumgärtel [Ber. Bunsenges. Phys. Chem. 82, 1154 (1978); Chem. Phys. 37, 21 (1979)].