Ionization state, excited populations and emission of impurities in dynamic finite density plasmas: I. The generalized collisional–radiative model for light elements

Abstract

The paper presents an integrated view of the population structure and its role in establishing the ionisation state of light elements in dyna mic, finite density, laboratory and astrophysical plasmas. There are four main issues, the generalised collisional-radiative picture for metastables in dynamic plasmas with Maxwellian free electrons and its particularising to light elements, the methods of bundling and projection for manipulating the population equations, the systematic production/use of state selective fundamental collision data in the metastable resolved picture to all levels for collisonal-r adiative modelling and the delivery of appropriate derived coeffi cients for experiment analysis. The ions of carbon, oxygen and neon are used in illustration. The practical implementation of t he methods described here is part of the ADAS Project.