Programs in Physics & Physical Chemistry
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|Manuscript Title: Numerical modelling of a chemical plasma. II. PLASKEM: a program to predict the variation with time of the number densities of chemical species within a plasma.|
|Authors: S.A. Roberts|
|Program title: PLASKEM|
|Catalogue identifier: ACZE_v1_0|
Distribution format: gz
|Journal reference: Comput. Phys. Commun. 18(1979)363|
|Programming language: Fortran.|
|Computer: ICL 1906A.|
|Operating system: GEORGE 4.|
|RAM: 63K words|
|Word size: 48|
|Keywords: Plasma chemistry, Laser discharge, Plasma physics, Atomic process, Laser physics.|
|Classification: 15, 19.1.|
Nature of problem:
PLASKEM is a program to predict the variation with time of the number densities of the various chemical species contained within a plasma, with particular interest in the plasma contained in the discharge tube of gas lasers. The chemical reactions within the plasma may include neutral molecule-neutral molecule collisions as well as electron- molecule, electron-ion and molecule-ion collisions. The plasma is assumed initially to contain known fractions of primary species which react to form secondary species.
The time rates of change of the number densities of the chemical species are described by a set of coupled, nonlinear differential equations. One equation is required for each primary and each secondary species. An additional equation is required to account for changes in the effective electron temperature. The equations are solved by three alternative methods, (1) Runge-Kutta method, (2) initially by the Runge- Kutta method and subsequently by a modified Hamming predictor-corrector method, (3) Gear's method.
The model used is a spatially independent one, reactions involving the container walls are neglected. The model assumes that the ambient gas temperature remains constant.
To solve 20 equations over a period of 300 ns on the ICL 1906A requires of the order of 50 s.
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