Mass Spectrometric Study of Combustion Plasma.
Annual rept. 1 Aug-70-31 Jul 71,
AEROCHEM RESEARCH LABS INC PRINCETON N J
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Several fuel-rich laminar, H2O2N2 flames seeded with potassium salts were employed in an investigation of the thermodynamics and kinetics of electron attachment phenomena produced by molybdenum, chromium, vanadium and boron additives. Mass spectrometry, electrostatic probes, microwave resonant cavity techniques, and optical spectroscopy are used to determine negative and positive ion identites, positive ion concentrations, electron concentrations and neutral species concentrations, respectively. It is shown that addition of molybdenum-containing compounds to flames seeded with potassium causes large reductions in concentrations of potassium atoms and extensive electron attachment. The results are interpreted in terms of a homogeneous reaction mechanism involving formation of the stable species KHMoO4, MoO3-, and HMoO4-, and enthalpy changes and equilibrium constants are inferred. Chromium and vanadium compounds are found to produce much smaller effects. The corresponding heat changes and equilibrium constants for the attachment reactions postulated to be responsible for observed negative ion formations are given. The kinetics of electron attachment to boron-containing species are currently under investigation. Axial concentration profiles for negative ions, electrons, H-atoms and positive ions are taken and the results interpreted in terms of a reaction rate coefficient for the process e HBO2 yields BO2- H. Author
- Plasma Physics and Magnetohydrodynamics
- Combustion and Ignition