Programs in Physics & Physical Chemistry
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|Manuscript Title: COLLRAD: a code for calculating the quasi-steady state population densities of excited states of hydrogen-like ions.|
|Authors: G.J. Tallents|
|Program title: COLLRAD|
|Catalogue identifier: AAID_v1_0|
Distribution format: gz
|Journal reference: Comput. Phys. Commun. 12(1976)205|
|Programming language: Fortran.|
|Computer: UNIVAC 1108, 1100/42.|
|Operating system: EXEC - 8.|
|RAM: 14K words|
|Word size: 36|
|Keywords: Collisional, Radiative, Recombination, Ionization, Hydrogen-like, Population density, Plasma physics, Atomic process.|
Nature of problem:
The evaluation of the population densities of the lower quantum states of a plasma ion, in general, involves the simultaneous solution of the rate equations (one for each quantum state) containing the rates of the various collisional and radiative processes which polulate and depopulate each quantum state. The time independent case where quasi- steady state equilibrium is established has been considered.
COLLARD caluclates quantum state densities for hydrogen-like ions using the collisional-radiative model of Bates et al. Coefficients giving the population densities of the excited states, and the rate of change of the ground state density are calculated for input electron density and temperature by solving a set of simultaneous linear equations.
Densities are calculated for excited quantum states in quasi-steady state equilibrium.
COLLARD is written in standard FORTRAN, except for the use of the NAMELIST facility.
For execution 1.7 s on the ANU UNIVAC 1100/42.
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