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Kinetics of a laser-pumped barium vapour. I. Development of a numerical model

A numerical model has been developed, which is well suited to describe the kinetics of a laser-pumped barium vapour. The numerous processes essential for the temporal evolution in the population of the various barium levels are outlined in detail. A number of approximations and simplifications have to be introduced to adapt the complex problem to a numerical solution at an economical expense. Since the authors consider all substantial features of the laser-pumped barium vapour like the population development of low-lying levels, the ionisation of the vapour, stimulated infrared emission and radiative transfer, the requirement for a quantitative interpretation of experimental data is fulfilled.