Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1317b&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1317
Physics
Scientific paper
We present the results obtained in low pressure microwave plasmas sustained in flowing mixtures of H2/He with the addition of Ar. We investigated experimentally their properties in terms of VUV emissions and photons fluxes using a VUV spectrometer. The spectra are dominated by Lyman alpha at 121.6 nm and H2 band emissions around 160 nm. The addition of Ar in the H2/He mixture largely affects the line emission. Lyman alpha emission increases by a factor of 2 in the presence of 20% Ar while the H2 bands decreases. This is a way to improve the monochromaticity of the lamp. Chemical actinometry method is used to determine the photons flux. We measured the temporal evolution of CO production issued from CO2 photolysis. A photon flux of 4.1015 s-1 is obtained for a power of 100 W. The photon flux varies linearly with the power at a rate of 6.1013 s1.W1. Those results are applied to studies on methane photolysis and help to explain mismatch between photochemical models and experiments.
Arzoumanian Emmanuel
Benilan Yves
Cottin Hervé
Es-Sebbar E.-T.
Fray Nicolas
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