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Spatial and time-dependent distribution of plasma parameters in the metal-halide arc lamp

It was shown by several authors that closed high pressure arc a.c. discharge in mercury vapors with addition of metal halide cannot be described in frames of the local thermodynamic equilibrium (LTE) model. However some plasma parameters (electron and high lying excited states densities as well as Hg metastable levels densities) are assumed to be in equilibrium with electron temperature and these assumptions are applied in plasma diagnostics. To verify these supposition the method of local plasma spectroscopy based on spatial and temporal distribution of spectral line profiles was developed. The experimental set up is based on diffraction spectrometer with large aperture, spatial scanning device and photodetector, which allows to carry out the measurements in chosen phases of current period. The software for data acquisition and processing is based on LabVIEW system. The original method of joint data processing was applied to data arrays containing spatial, spectral and temporal distribution of a source surface radiance. The method is based on principal component theory, it takes into account the correlation between spectral emissivities inside spectral line profiles and allows to decrease the processing time as well as the noise influence on results in processes of instrument distortion elimination and Abel inversion. We investigated a mercury high pressure lamp with addition of thallium iodide which operates at input power of 250 W (50 Hz) The ground state Hg atom and electron density distribution were determined by some mercury and thallium spectral line profiles, the high state densities were received from radial and temporal dependencies of integral line intensities, the ground state thallium and Hg metastable state densities were determined from analysis of self-reversed line profiles. As a result it was shown that Saha balance between electron and high lying excited states densities takes place only for core part of discharge tube and for time moments when discharge current is near maximum values. An unexpected broadening of some thallium spectral lines was found out, more significant in the external part of discharge.