Etudes spectroscopiques comparees des interactions d'un plasma froid differe d'azote avec le formaldehyde, le glyoxal et le biacetyle

Abstract

The reactions of a nitrogen cold plasma extracted from the discharge (NCPED) with formaldehyde (F) and glyoxal (Gl) are studied by emission spectroscopy. The formation of Gl( 1A u) arises from the dimerization of HCO which originates from the reaction of N( 4S) with . Emission of the 1A u 1A g transition of Gl is observed with a very well-developed vibrational structure which allows the new attribution of thirty bands to this transition. In the reaction of NCPED with Gl, N 2(A 3Σ + u) and N( 4S) are the initiators of the excitation of Gl molecules to the 3A u state. These excited species, when Gl is in excess, are deactivated by a triplet-triplet annihilation reaction which produces Gl( 1A u). The behaviour of Gl in the NCPED is compared with that of biacetyl which has been previously studied.