The change of the spectral parameters of a single autoionization resonance with concentration in gaseous media is studied in terms of the isotropic Lorentz-Lorenz model. It is shown that the effect of a local field may result in a shift, narrowing, or broadening of the resonance, as well as in a change in its amplitude and the character of interference of the discrete state with the continuum. By appropriate selection or variation of the partial pressures of substances in the mixture, the separation of a particular regime is possible. An analogy to the laser-induced narrowing of autoionization resonances is drawn.
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