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This work presents swarm parameters of electrons (the bulk drift velocity,the bulk longitudinal component of the diffusion tensor, and the effectiveionization frequency) in C$_2$H$_n$, with $n =$ 2, 4 and 6, measured in ascanning drift tube apparatus under time-of-flight conditions over a wide rangeof the reduced electric field, 1 Td $\leq\,E/N\,\leq$ 1790 Td (1 Td =$10^{-21}$ Vm$^2$). The effective steady-state Townsend ionization coefficientis also derived from the experimental data. A kinetic simulation of theexperimental drift cell allows estimating the uncertainties introduced in thedata acquisition procedure and provides a correction factor to each of themeasured swarm parameters. These parameters are compared to results of previousexperimental studies, as well as to results of various kinetic swarmcalculations: solutions of the electron Boltzmann equation under differentapproximations (multiterm and density gradient expansions) and Monte Carlosimulations. The experimental data are consistent with most of the swarmparameters obtained in earlier studies. In the case of C$_2$H$_2$, the swarmcalculations show that the thermally excited vibrational population should notbe neglected, in particular, in the fitting of cross sections to swarm results.

Electron swarm parameters in C$_2$H$_2$, C$_2$H$_4$ and C$_2$H$_6$: measurements and kinetic calculations