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Article Contents

ABSTRACT

1.INTRODUCTION

2.A SHORT INTRODUCTION TO ATOMIC STRUCTURE
2.1.The Bohr atom
2.2.Level notation in multi-electron systems
2.3.Binding energies
2.4.Abundances

3.BASIC PROCESSES
3.1.Excitation processes
3.2.Ionisation processes
3.3.Recombination processes
3.4.Charge transfer processes

4.IONISATION BALANCE
4.1.Collisional Ionisation Equilibrium (CIE)
4.2.Non-Equilibrium Ionisation (NEI)
4.3.Photoionisation Equilibrium (PIE)

5.EMISSION PROCESSES
5.1.Continuum emission processes
5.2.Line emission processes
5.3.Some important line transitions

6.ABSORPTION PROCESSES
6.1.Continuum versus line absorption
6.2.Continuum absorption
6.3.Line absorption
6.4.Some important X-ray absorption lines
6.5.Curve of growth
6.6.Galactic foreground absorption

7.GALACTIC FOREGROUND EMISSION

8.COOLING FUNCTION

9.IONISATION AND EXCITATION BY NON-THERMAL ELECTRONS

10.PLASMA MODELLING
10.1.Available codes
10.2.Important parameters
10.3.Multi-Temperature emission and absorption

REFERENCES