Investigation of the interactions of long-lived excited atoms in the afterglow of gas discharge plasma

Details Investigation of the interactions of long-lived excited atoms in the afterglow of gas discharge plasma Investigation of the interactions of long-lived excited atoms in the afterglow of gas discharge plasma

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jphcs..44...80b&link_type=abstract

Journal of Physics: Conference Series, Volume 44, Issue 1, pp. 80-89 (2006).

Physics

1

Scientific paper

When an electric discharge is fired in a gas consisting of atoms or molecules with long-lived excited states there are several inelastic processes releasing fast electrons in the afterglow plasma after the end of the current pulse. Most common among them are the chemiionization and de-excitation electron-atom collisions. Here these processes are investigated by measurements of the reactant particle densities at the entrance and at the exit channels of the reactions. In this way the rate coefficients of the ionising collisions of the couples Ne3P2-Ne3P2, Ar3P2-Ar3P2, Kr3P2-Kr3P2, Xe3P2-Xe3P2 as well as the rate coefficients for chemi-ionization of the ground state mercury atoms by collision with Ne 33P2 and Ar 43P2, 1, 0 atoms were obtained. By similar measurements the rate coefficients for super elastic collisions between electrons and excited heavy rare gases atoms as well as mercury atoms in the electron temperature range 500 - 2000 K were obtained. By monitoring the decay of the excited atom's density and electron's density and temperature the rate coefficients of electron impact induced transfer of excitation between the levels of configuration np5(n + 1) s in Ne, Kr and Xe were determined. In the same way were derived the rate coefficients of the transfer of excitation between Cd 63P2, 1, 0 levels induced by collisions with ground state cadmium and neon atoms. The diffusion coefficients of magnesium atoms in rare gases and their reflection coefficients from the vessel metallic wall are determined. Besides, the diffusion coefficients of metastable Cd 63P2, 0 atoms in neon are also determined.

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