| Issue |
J. Phys. III France
Volume 4, Number 12, December 1994
|
|
|---|---|---|
| Page(s) | 2593 - 2600 | |
| DOI | https://doi.org/10.1051/jp3:1994299 | |
J. Phys. III France 4 (1994) 2593-2600
Active species in N2 flowing post-discharges
A. Ricard1 and A. R. de Souza21 LPGP, Bât. 212, CNRS, Université Paris-Sud, 91405 Orsay, France
2 Depto. de Fisica, UFSC, 88.000, Florianopolis, SC, Brazil
(Received 3 December 1993, revised 27 April 1994 and 20 July 1994, accepted 1 September 1994)
Abstract
The afterglow in D.C. and H.F. N
2 flowing discharges has been analysed by emission spectroscopy. Production of excited species has been studied in conditions
of late
s and early
s afterglows. The late afterglow is characterized by the N
2 1st positive emission with a strong enhancement of the N
2(B,
v' = 11) level compared to the other N
2(B,
v') levels which is a signature of N atom density. By NO titration, we have determined that N/N
2 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 N
2(A) + N
2(X,
v>5) excitation transfer reaction. By introducing a little CH
2(10
-4-10
-3) or H
2(10
-2-10
-1) into the N
2 D.C. and H.F. postdischarges, N
2(A) quenching rates have been obtained indicating that the N
2(A) is only excited on the two first vibrational states in the early afterglows.
© Les Editions de Physique 1994