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Reactions of Atoms and Free Radicals Studied in Discharge-Flow Systems

  • M. A. A. Clyne

Abstract

It has been known for many years that certain ground state atoms may be produced by the dissociation of the corresponding molecular gas in a high-voltage electric discharge; such atoms may persist for times up to several seconds at total pressures near 1 torr.1–3 The main emphasis of studies using the modern discharge-flow method is on quantitative measurements of rate constants of elementary reactions of atoms and small free radicals at temperatures from 200 to 800 K and total pressures between 0.1 and 10 torr. In this method, the time dependences of concentrations are determined by measurement at different distances along the axis of a tube, usually cylindrical; atoms are rapidly pumped along the length of this flow tube under steady state conditions. In the case of a velocity of gas flow which is constant with respect to both axial and radial displacement (plug flow), distance along the tube axis and time are in direct proportion, allowing a simple calculation of reaction rates.

Keywords

Electron Paramagnetic Resonance Vibrational Excitation Flow Tube Recombination Reaction Flash Photolysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Company Ltd. 1973

Authors and Affiliations

  • M. A. A. Clyne
    • 1
  1. 1.Department of ChemistryQueen Mary CollegeLondon, E.1UK

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