
Accession Number : AD0621364
Title : RADIATIVE TRANSFER IN LINES FOR MEDIA IN STATISTICAL EQUILIBRIUM.
Descriptive Note : Scientific rept.,
Corporate Author : HARVARD COLL CAMBRIDGE MASS PRESIDENT AND FELLOWS
Personal Author(s) : Kalkofen,Wolfgang
Report Date : 25 JUN 1965
Pagination or Media Count : 32
Abstract : The line transfer problem is discussed for a twolevel atom and extended to an Nlevel atom. For N = 2 the source function is obtained, and nonlinear and linear integrodifferential equations are derived expressing the transfer problem subject to the condition of statistical equilibrium. From the differential equation the corresponding integral equations for the line source function are determined, and the integral kernels are discussed for the case of depthdependent absorption profiles. The line components of the source function are derived for an Nlevel atom. The corresponding coupled integral equations for the resonance line components of the source function are discussed for the limit of low temperatures, and a method of solution is outlined. An analytic solution is obtained for the case of constant coefficients and integral kernels which are single exponential functions. (Author)
Descriptors : (*KINETIC THEORY, STATISTICAL MECHANICS), (*WAVE PROPAGATION, GASES), (*ELECTRON TRANSITIONS, LINE SPECTRA), THERMODYNAMICS, ATOMIC ENERGY LEVELS, ELECTRON DENSITY, DIFFERENTIAL EQUATIONS, INTEGRAL EQUATIONS
Distribution Statement : APPROVED FOR PUBLIC RELEASE