Experimental evidence of Penning ionization role in a low pressure direct current nitrogen glow discharge

On the basis of experimental measurements of the electric field (which varies from 5 to 60 V/cm) and the N-atom relative density variation (one order of magnitude), mechanisms of ionization and dissociation in direct current glow discharges are discussed for pressures ranging from 0.5 to 5.0 torr and current between 1 and 50 mA. It is shown that: (i) at low pressure (E/N > 40 Td) ionization is governed by electronic impact and Penning reactions; (ii) at high pressure (E/N < 40 Td) the ionization is mainly governed by Penning reactions

Laser and Emission Spectroscopy in H2_{2} and H2_{2}-N2_{2} dc Discharges

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

Doppler-broadened Hα line shapes in A dc low-pressure discharge for TiN deposition

International audienc

Focusing effects of a laser beam in the non resonant MPI of gases

SIGLECNRS-CDST / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc