Vol. 26, issue 10, article # 13

Abstract:

The paper repots on experimental and theoretical research in the effect of chlorine concentration on the radiation efficiency of a coaxial dielectric barrier discharge Xe-Cl₂ excilamp at a working mixture pressure of 240-250 Torr. The experiments were performed in the range of Cl₂ concentrations 0.01-1%. The characteristics of the barrier discharge were calculated in the framework of a one-dimensional magnetohydrodynamic model in the range of Cl₂ concentrations 0.1-5%. It is shown that at a chlorine concentration of 0.01-0.1%, the radiation intensities of the Xe₂* band (172 nm) and XeCl* band (308 nm) are comparable. As the Cl2 concentration in the mixture is increased, the radiation intensity of Xe₂ decreases rapidly, and at a chlorine concentration of 0.2%, the radiant flux of the discharge is dominated by the XeCl (B → X) band with a maximum intensity at 308 nm. The maximum radiation efficiency of this band is attained at chlorine concentrations of 0.4-0.5%. The numerical simulation shows that the total power deposited in the discharge increases with the chlorine concentration due to the increase in the power expended in the heating of positive and negative ions. The power dissipated by electrons decreases as the chlorine concentration in the working mixtures is increased. Recommendations are given on choosing the chlorine content in the mixture to decrease the VUV radiation intensity of the second Xe₂* excimer continuum with a little decrease in excilamp efficiency.

Keywords:

XeCl, excilamp, radiation efficiency, dielectric barrier discharge, magnetohydrodynamic model

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