J. Phys. III France
Volume 6, Numéro 9, September 1996
Page(s) 1147 - 1155
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. Sultan

Laboratoire 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)

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.

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