Optical Emission Spectroscopy of Atmospheric Glow Discharge Generated in Nitrogen-Methane Gaseous Mixtures

abstract

English

This work extends our previous investigation of nitrogen-methane (N2-CH4) atmospheric glow discharge for simulation chemical processes in Titan’s or early Earth prebiotic atmospheres. Experiments are focused on water (H2O) addition to the atmospheric glow discharge fed by N2-CH4 mixture and diagnostic of this discharge by optical emission spectroscopic (OES). The electrode system used the standard configuration of the gliding arc discharge but due to the low applied power as well as low gas velocity the discharge is not moving along the electrodes. The discharge was operated at an applied voltage of 400 V and discharge current in range 15 to 40 mA in pure nitrogen enriched by 1-5 % of CH4 (both gases having quoted purity of 99.995 %) with admixture of 2 % of H2O at the total flow rate of 100 sccm. The spectra belonging to various bands of CN violet and C2 spectral systems were recorded as well as spectral bands of OH and very weak NH bands. Also the 2nd positive and 1st negative nitrogen spectral systems were recorded. Rotational temperature was calculated from obtained data depending on the experimental conditions.

Atmosphere of Titan, atmospheric glow discharge in N2-CH4 mixture, optical emission spectroscopy

HORÁK, J.; TÖRÖKOVÁ, L.; MAZÁNKOVÁ, V.; KRČMA, F.; MASON, N.J.; MATEJČÍK, Š.

25. 4. 2016

Vilnius

neuvedeno

From star and planet formation to early Life. Book of Abstracts

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