A collisional-radiative model applicable to argon discharges over a wide range of conditions. III. Application to atmospheric and subatmospheric pressure arcs

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<jats:p>For pt.II see ibid., vol.22, p.632 (1989). The extensive collisional-radiative model for an argon atom plasma is applied to atmospheric and subatmospheric pressure wall-stabilised arcs in order to clarify the mechanisms by which the excited levels are populated in the axial region of these discharges. Computations are carried out for various sets of input parameters, such as the electron kinetic temperature T<jats:sub>e</jats:sub>, the atom temperature T<jats:sub>a</jats:sub>, the ion temperature T<jats:sub>i</jats:sub>, the electron number density n<jats:sub>e</jats:sub>, the ground-state atom population n<jats:sub>1</jats:sub>, the plasma column radius R and the escape factors Lambda<jats:sub>mn</jats:sub>and Lambda<jats:sub>m</jats:sub>, characterising the non-equilibrium plasmas under consideration. The predicted values of the populations in the excited levels and the qualities derived from them, as well as the values of the critical electron densities for establishing the local thermodynamic equilibrium in the axial region of the arcs investigated, are in good agreement with the corresponding experimental results. The effect of the changes in the discharge parameters T<jats:sub>e</jats:sub>, T<jats:sub>a</jats:sub>, n<jats:sub>e</jats:sub>, R and Lambda<jats:sub>1n</jats:sub>on the population mechanism, together with the role played by the recombination flow of electrons from a continuum, the deviations of the actual electron distribution function from the corresponding Maxwellian form and by the atom-atom inelastic collisions, are also shown.</jats:p>

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