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Title: Electron drift velocities in He and water mixtures: Measurements and an assessment of the water vapour cross-section sets

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.
Authors:
;  [1] ;  [2] ; ; ;  [3] ;  [4] ;  [5]
  1. Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, 62251, Cuernavaca, Mor. (Mexico)
  2. División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, Av. San Pablo 180, 02200, México, D.F. (Mexico)
  3. School of Engineering and Physical Sciences, James Cook University, Townsville 4810 (Australia)
  4. School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001 (Australia)
  5. (Malaysia)
Publication Date:
OSTI Identifier:
22308752
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACCURACY; APPROXIMATIONS; CROSS SECTIONS; ELECTRIC FIELDS; ELECTRON DRIFT; ELECTRONS; HELIUM; MIXTURES; MOMENTUM TRANSFER; PULSES; SCATTERING; WATER VAPOR