Abstract
Most optical emission line intensities remain unchanged for a mercury HID plasma, exposed to coherent argon ion laser beam Innova 308 C (476.5 nm) in points far from electrodes. Small raise of Hg-546.08 nm line is due to photo-excitation of Ar+ ions, followed by excitation transfers through collision processes from excited (Ar+)* ions to Ar atoms, then from excited (Ar)* to Hg atoms. When the laser beam hits the electrode tip (photoelectric effect), the amount of electrons involved in plasma collisions increases: all characteristic emission spectral lines are intensifying. Electron temperature and concentration were also calculated. Differential Scanning Calorimetry performed in case of tungsten electrode with emissive material (Y2O3, BaCO3, CaCO3, WO3), linear and non-isothermally heated (0.17 K s-1) in flowing air, from 290.61 to 1603.72 K (platinum crucible), revealed both endothermic (CaCO3 and of BaCO3 decompositions) and exothermal (obtaining CaWO4, BaWO4 and Ba3WO6) processes. Thermogravimetry Analysis showed a mass decrease of 0.498%, in 290.61−505.15 K temperature range, due to water release. Oxidation of tungsten electrode causes a significant mass increase of 17.292% in 809.15−1183.15 K range. BaWO4, Ba3WO6 and WO3 sublimations gave a mass fall of 6.757% in 1513.15−1603.72 K range. No thermal effects were recorded on heating in argon atmosphere, from 446.15 to 1596.15 K, in alumina crucible.
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Harabor, NA., Harabor, A., Rotaru, P. et al. High pressure mercury AC discharge tube exposed to coherent laser: optical, electrical and thermal aspects. J Therm Anal Calorim 148, 10515–10529 (2023). https://doi.org/10.1007/s10973-023-12380-1
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DOI: https://doi.org/10.1007/s10973-023-12380-1