Monte Carlo Simulation of Radiation in Scattering Volumes with Line Structure

Consideration is given to four approximate fast algorithms for direct Monte Carlo simulation that take into account the line structure of an absorption spectrum. It is shown that all algorithms allow calculation of radiation transfer in scattering volumes with sufficient accuracy for practical needs, particularly at optical thickness based on line centers of order unity. The hemispherical emissivity and hemispherical emissivity of a plane layer for tau0 of 1.0 are shown in tabular form. (AIAA)