DOI: 10.1051/jp3:1996174
J. Phys. III France 6 (1996) 1147-1155
Laser and Emission Spectroscopy in H 2 and H 2-N 2 dc Discharges
J. Amorin, G. Baravian, S. Bockel, A. Ricard and G. SultanLaboratoire de Physique des Gaz et des Plasmas, URA CNRS, bâtiment 212 Université Paris XI, 91405 Orsay, France
(Received 7 February 1996, revised 29 March 1996, accepted 30 April 1996)
Abstract
Two-photon Laser Induced Fluorescence (LIF) was used for the determination of H atom concentration in H
2 and N
2-H
2 dc discharges. A model was developed which takes into account the absorption of two photons by ground state atoms, ionization
by absorption of a third photon, induced fluorescence, stimulated emission, and collisional quenching. The H-Atom LIF profile
analysis, associated with PhotoFragment Translational Spectroscopy (PFTS) was used to measure the concentration of ammonia
synthesized in N
2-H
2 dc discharges, as a function of % H
2 in the mixture.
© Les Editions de Physique 1996