Laser-induced gas-breakdown model

Abstract
A one-dimensional model oriented toward a thorough understanding of line and continuum emission from a CO2 laser-induced helium plasma is presented. The model combines a time-dependent calculation of the ionization and radiation dynamics with a lagrangian hydrodynamic simulation code. Detailed collisional radiative models involving many neutral and ion excited levels are used to predict the plasma ionization state. A radiation transport algorithm including self-trapping effects and Stark broadening is developed which directly gives the space- and time-resolved spectrum of the breakdown plasma. Calculated plasma expansion, time- and space-resolved absolute light intensities and line and continuum spectral shapes compare quite favorably with experimental data

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