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Homogeneous gas phase models of relaxation kinetics in neon afterglow

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Author(s): Marković Vidosav Lj. | Gocić Saša R. | Stamenković Suzana N.

Journal: Facta Universitatis - series : Physics, Chemistry and Technology
ISSN 0354-4656

Volume: 5;
Issue: 1;
Start page: 33;
Date: 2007;
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Keywords: electrical breakdown | time delay | memory effect | neon afterglow | nitrogen | metastable states | relaxation kinetics | homogeneous gas phase models

ABSTRACT
The homogeneous gas phase models of relaxation kinetics (application of the gas phase effective coefficients to represent surface losses) are applied for the study of charged and neutral active particles decay in neon afterglow. The experimental data obtained by the breakdown time delay measurements as a function of the relaxation time td (τ) (memory curve) is modeled in early, as well as in late afterglow. The number density decay of metastable states can explain neither the early, nor the late afterglow kinetics (memory effect), because their effective lifetimes are of the order of milliseconds and are determined by numerous collision quenching processes. The afterglow kinetics up to hundreds of milliseconds is dominated by the decay of molecular neon Ne2 + and nitrogen ions N2 + (present as impurities) and the approximate value of N2 + ambipolar diffusion coefficient is determined. After the charged particle decay, the secondary emitted electrons from the surface catalyzed excitation of nitrogen atoms on the cathode determine the breakdown time delay down to the cosmic rays and natural radioactivity level. Due to the neglecting of number density spatial profiles, the homogeneous gas phase models give only the approximate values of the corresponding coefficients, but reproduce correctly other characteristics of afterglow kinetics from simple fits to the experimental data.
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