Abstract
The electron attachment properties of are experimentally investigated using a pulsed Townsend setup. Different / and / mixtures, with mole fractions ranging from to 1, are characterized. The effective ionization rate coefficient, electron drift velocity and reduced longitudinal electron diffusion coefficient in these mixtures are obtained. For low mole fractions of , the effective ionization rate coefficient is compared to calculations from available electron scattering cross sections, and is also used for estimating the electron attachment cross section of . For pure , the present data is compared to early data from a steady-state Townsend experiment. The presentation of the measurement results is followed by a discussion on the properties of and and their significance for gaseous electrical insulation.
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