I have decided to put the source codes of some of my computer programs online that I have written in the past as well as more recently. The older programs are all in PL/1 or Fortran, but the newer ones (which are either conversions of some old programs or completely new developments) largely in C/C++. I shall be adding gradually more programs as soon as I have adopted suitable ones for general use. I have already mentioned those programs where I did not have the opportunity yet to prepare them for publication (or where I am not sure yet whether to publish them at all), so for the time being you have to contact me if you want to know more about those.

Mathematical/ Computational Calculation of Laguerre Polynomials (PL/1) Laguerre Polynomials for Large Indices (PL/1) Calculation of Gamma Function (PL/1) Calculation of Exponential Integrals (PL/1) Spherical Polar Coordinate Transformation (PL/1) Basic Arithmetics with Practically Unlimited Numerical Range (PL/1) Solution (Inversion) of Linear System of Equations (C/C++) Atomic Physics Bound Radial Wave Function of Hydrogen-like Atoms (PL/1) Bound Radial Wave Function for Very High Levels (PL/1) Continuum Wave Function of Hydrogen-like Atoms (PL/1) Continuum Wave Function for Very Small Energies (PL/1) Calculation of Scattering-, Photoionization- and Recombination Cross Section (PL/1) Level Population of High Rydberg States (Fortran) Plasma Physics Ion Densities of N Constituents in Chemical Equilibrium (PL/1) Ion Production Rates in Upper Atmosphere (PL/1) Non-Linear Plasma Oscillations Induced by Electromagnetic Waves (Fortran) Level Population of High Rydberg States (Fortran) Emission Spectrum of High Rydberg States (Fortran) Scattering Coefficient of High Rydberg States (Fortran) Non-LTE Plasma Diffusion in Inhomogeneous Atmospheres (Fortran) Ionospheric Electron Energy Spectrum in Local Equilibrium (PL/1) Radiative Transfer Radiative Transfer Code for a Plane Parallel Multiple Scattering/ Absorbing Atmosphere (C/C++) Kernel Functions for Radiative Transfer in Spectral Lines (C/C++) Polarized Line Transfer in Plane Parallel Scattering Atmosphere (PL/1) Inverse Radiative Transfer Problem (C/C++) Other 2D Elastic and Inelastic Collision (Fortran, C/C++) 3D Elastic and Inelastic Collision (Fortran, C/C++)