PROGRAM SUMMARY
Title of program:
CRMODEL
Catalogue identifier:
ADNK
Ref. in CPC:
135(2001)199
Distribution format: tar gzip file
Operating system: Linux 2.2 (SuSe 6.4), Windows 95
High speed store required:
3MK words
Number of lines in distributed program, including test data, etc:
53344
Keywords:
Plasma physics, Atomic level population densities,
Collisional-radiative ionization, Recombination rate coefficients,
Atomic process.
Programming language used: C++
Computer:
Pentium Workstation .
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.
Method of solution:
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.
Restrictions:
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.
References:
[1] J.A.M. van der Mullen, Phys. Rep. 191, (2&3) (1990),109.