The focus of this book is on the generation of plasma active species including N2, such as molecules in electronic, vibrational, and rotational states, as well as dissociated atoms or radicals. The method of NO titration of N and O-atom density, as well as the percentage of afterglow from N-atom recombination, are described in detail. The afterglow kinetics equations are clarified, as well as the intensity ratio approach for calculating the radiative species density from the density of N-atoms. The densities of O, H, and C atoms, N2(A) and N2(X,v>13) metastable molecules, NH, NO, and CN radicals may all be calculated using this method. Plasmas and afterglows were created using a microwave supply at lowered gas pressure in Montreal and Toulouse Universities, and at atmospheric gas pressure in Orsay, Pau, and Toulouse Universities. Surprisingly, the concentrations of N-atoms and N2(A) metastable molecules in the afterglow zones are remarkably similar. At low and atmospheric gas pressures, the production of active species in N2 and N2-O2 afterglows of electrical discharges is investigated. Microwave discharges at a wide range of gas pressures from a few Torr to 100 Torr, as well as corona discharges at atmospheric gas pressure, produce them. For low pressure microwave and atmospheric pressure corona discharges, the procedures of bacteria decontamination in N2-O2 afterglows are outlined. In microwave afterglows, the transmission of N-atoms across porous membranes is investigated at medium pressure (10-100 Torr).
Author(S) Details
André Ricard
LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, 31062 Toulouse Cedex 9, France.
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