The effect of the inhomogeneity of a scattering and absorbing medium of finite thickness on the evolution of spectrum lines which appear when it is illuminated by nonstationary energy sources is examined. Special attention is devoted to the role of scattering in the continuum spectrum. It is assumed that the inhomogeneity arises from the variation in the scattering coefficient with depth, which may be increasing or decreasing on approaching the illuminated boundary. Two types of nonstationarity of the external energy source are studied with a shape corresponding to δ(t), the Dirac function, and H(t), the unit step function of Heaviside. The question of using observed time changes in the profiles of spectrum lines for determining their optical characteristics, the frequency dependence of the external energy sources, and the physical properties of the illuminated medium itself, is studied.

研究了有限厚度的散射和吸收介质的不均匀性对非稳态能源照射时出现的谱线演变的影响。特别关注连续谱中散射的作用。假设不均匀性是由散射系数随深度的变化引起的，在接近照明边界时，散射系数可能会增加或减少。研究了外部能量源的两种非平稳性，其形状对应于 δ(t)（狄拉克函数）和 H(t)（Heaviside 单位阶跃函数）。使用光谱线轮廓中观察到的时间变化来确定其光学特性、外部能源的频率依赖性的问题，