The shape of emission lines from a spatially inhomogeneous gas containing macroscopic particles

Abstract

A theoretical study of the shape of spectral lines emitted from a spatially inhomogeneous gas in the presence of a condensed phase has been carried out. The gas-phase atoms emit and absorb light while the macroscopic particles and the walls emit, absorb, and scatter light. The spatial inhomogeneity is described by distribution of the gas-phase temperature with a homogeneous core and a monotone change at the periphery, corresponding to a linear change of the blackbody radiation. The radiation transport equation is solved by using successive approximations. The dependence of the radiation intensity on the radiation characteristics and the inhomogeneity characteristics of the two-phase medium has been established. The calculation of the shape of spectral lines takes into account the fact that, inside the line, the optical density of the layer, the probability of photon survival, and radiation sources in the two-phase medium change simultaneously.