A broadband excimer-halogen emitter utilizing xenon bromide and iodide

The results are given of an investigation of the output characteristics of an electric-discharge excimer-halogen UV emitter utilizing a $\mathrm{Xe}/\mathrm{Br}_2/\mathrm{J}_2$ mixture. A longitudinal glow discharge with an interelectrode spacing of $50$ cm and inside diameter of the discharge tube of $1.4$ cm is ignited at the working mixture pressure of $\le1$ kPa and power input to the plasma of $10$–$350$ W. A study is performed of the current-voltage characteristics of the discharge, plasma radiation spectra in the $190$–$350$ nm range, and distributions of the brightness of radiation of molecules as a function of the pumping conditions, as well as of pressure and partial composition of the gas mixture. It is demonstrated that the plasma of the discharge being investigated is a source of broadband UV radiation in a system of bands of $253$ nm $\mathrm{Xe}\mathrm{J}$, $282$ nm $\mathrm{Xe}\mathrm{Br}$, and $292$–$310$ nm $\mathrm{Br}_2^*$, which are joined by the radiation of resonance line of iodine atom with $\lambda=206$ nm. The total power of UV radiation of plasma increases linearly with the electrical power of the glow discharge.