Active species in N2 flowing post-discharges

André Ricard , A. de Souza

The afterglow in D.C. and H.F. N2 flowing discharges has been analysed by emission spectroscopy. Production of excited species has been studied in conditions of late Δt =(1 - 5) ×10-1 s and early Δt =(0.5 - 5) ×10-2 s afterglows. The late afterglow is characterized by the N2 1st positive emission with a strong enhancement of the N2(B, $v'~=~11$) level compared to the other N2(B, v') levels which is a signature of N atom density. By NO titration, we have determined that N/N2 dissociation degrees are respectively 4.1% and 2.7% in a 60 W H.F. and in a 50 mA D.C. post-discharge at 4.5 Torr. The early afterglow is characterized by a strong 1st positive emission which has been analysed from the N2(A) + N2(X, v>5) excitation transfer reaction. By introducing a little CH2(10-4-10-3) or H2(10-2-10-1) into the N2 D.C. and H.F. postdischarges, N2(A) quenching rates have been obtained indicating that the N2(A) is only excited on the two first vibrational states in the early afterglows.

Domaines: Articles anciens

André Ricard, A. de Souza. Active species in N2 flowing post-discharges. Journal de Physique III, 1994, 4 (12), pp.2593-2600. ⟨10.1051/jp3:1994299⟩. ⟨jpa-00249285⟩