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Manuscript Title: RAD-TRAP, a program for the computation of the eigenvalues and eigenfunctions of the Holstein radiation-trapping equation.
Authors: A.F. Molisch, B.P. Oehry, W. Schupita, G. Magerl
Program title: RAD-TRAP
Catalogue identifier: ACLB_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 74(1993)81
Programming language: Fortran.
Computer: VAX 3100.
Operating system: VMS.
RAM: 500K words
Word size: 32
Keywords: Trapping radiation, Radiative transfer, Fredholm integral Equations, Lifetime measurements, Lineshape measurements, Eigenvalues.
Classification: 21.2.

Nature of problem:
Computation of the eigenvalues and eigenfunctions of the Holstein integral equation describing radiation trapping in an atomic vapor (in one-dimensional geometries).

Solution method:
Reduction of the Fredholm integral equation of the second kind to an algebraic eigenvalue problem which is solved by standard methods.

Restrictions of the achievable accuracy by memory and run-time limitat- ions.

Unusual features:
Uses subroutines from a standard library of mathematical subprograms, NAGLIB.

Running time:
Strongly dependent on the chosen geometry, the lineshape, the opacity and especially the required accuracy; will be between 1 and 1000 CPU seconds in most practical cases.