Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 141, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4885357
Keywords
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Funding
- Australian Research Council through Centres of Excellence programme
- Australian Research Council through Discovery programme
- UNAM [PAPIIT IN 111014]
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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. (C) 2014 AIP Publishing LLC.
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