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Manuscript Title: CRModel: a general collisional radiative modeling code.
Authors: A. Hartgers, J. van Dijk, J. Jonkers, J.A.M. van der Mullen
Program title: CRMODEL
Catalogue identifier: ADNK_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 135(2001)199
Programming language: C++.
Computer: Pentium Workstation.
Operating system: Linux 2.2 (SuSe 6.4), Windows 95.
RAM: 3M words
Keywords: Plasma physics, Atomic level population densities, Collisional-radiative ionization, Recombination rate coefficients, Atomic process.
Classification: 19.1.

Nature of problem:
The program calculates atomic level population densities of atoms in low temperature plasmas. Collisional-radiative recombination and ionization rate coefficients, radiative energy losses, individual rate coefficients, and effective production and destruction flows between independent levels are also calculated.

Solution method:
The radiative transition probabilities and collisional cross sections can be specified. These are used to construct a set of linear equations relating the level densities to each other. The number of considered levels can be significantly reduced through the use of a hybrid numerical/analytical cut off technique [1]. The set of linear equations is then solved by means of a matrix inversion.

The only states that the model can consider are a ground state, the next ionized ground state and any number of excited states in between those. A further restriction is that the density of these excited states should be small compared to either the ground state density or the ionized state density. However, the total number of considered levels is only limited by available memory.

[1] J.A.M. van der Mullen, Phys. Rep. 191, (2&3) (1990),109.