de Urquijo, J., Basurto, E., Juárez, A.M., Ness, K.F., Robson, R.E., Brunger, M.J., and White, R.W. (2014) Electron drift velocities in He and water mixtures: measurements and an assessment of the water vapour cross-section sets. Journal of Chemical Physics, 141. 014308. pp. 1-11.

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Abstract

The drift velocity of electrons in mixtures of gaseous water and helium is measured over the range of reduced electric fields 0.1–300 Td using a pulsed-Townsend technique. Admixtures of 1% and 2% water to helium are found to produce negative differential conductivity (NDC), despite NDC being absent from the pure gases. The measured drift velocities are used as a further discriminative assessment on the accuracy and completeness of a recently proposed set of electron-water vapour cross-sections [K. F. Ness, R. E. Robson, M. J. Brunger, and R. D. White, J. Chem. Phys.136, 024318 (2012)]. A refinement of the momentum transfer cross-section for electron-water vapour scattering is presented, which ensures self-consistency with the measured drift velocities in mixtures with helium to within approximately 5% over the range of reduced fields considered.

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