LIF spectroscopy of OH radicals in a micro-flow DC discharge in Ar and He with a liquid electrode

A. Nikiforov , L. Li , Q. Xiong , C. Leys , X.P. Lu

The laser-induced fluorescence spectroscopy on a micro-flow discharge with water electrode is carried out in order to investigate OH radicals. The branches P(6), P(4) and P(3) of X, ′′ = 0−A, ′ = 1 transition are used. Laser-induced fluorescence is used in order to estimate the density of OH radicals and density of water vapor in a core of the plasma. Sputtering yield of HO from the liquid electrode is calculated based on experimental data. It is revealed that plasma core consists of 8-10% of water in both Ar and He discharges. The density of OH radicals in the micro-flow He plasma is higher than in the glow discharge with liquid electrode and in Ar micro-flow discharge due to constriction of the positive column and different mechanism of the OH radical production.

Mots clés: Physical Sciences

Domaines: Physique [physics]

A. Nikiforov, L. Li, Q. Xiong, C. Leys, X.P. Lu. LIF spectroscopy of OH radicals in a micro-flow DC discharge in Ar and He with a liquid electrode. European Physical Journal: Applied Physics, 2011, 56 (2), pp.24009. ⟨10.1051/epjap/2011110165⟩. ⟨hal-00746212⟩