Abstract
The influence of the spatial dependence of the line profile on the shape of a line with asymmetric self-reversal emitted from inhomogeneous discharge plasmas is investigated by solving the equation of radiative transfer using relative distribution functions for the source function and the line broadening including complex overlapping lines. The theoretical results show that the features of an asymmetric lineshape are related to the broadening mechanisms and enable us to infer from the recorded line the dominant broadening mechanism. These results are experimentally confirmed using self-reversed lines emitted from high-pressure lighting plasmas. Our detailed analysis suggests that the one-parameter-approximation (OPA) model is able to reproduce satisfactorily the spectral emissivity as in the case of a spatially constant profile. An improved technique for deducing the emissivity from line-reversal is developed and applied to plasma temperature determination of metal-halide lamps. The obtained results are optimized taking into account the functional dependence of the line width and shift on the position.
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