Collision-time simulation technique for pressure-broadened spectral lines with applications to Ly-α

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Abstract
We introduce a new simulation technique which is based on the distribution of the times of collision between plasma particles and a radiating atom. This procedure generates a continuous flow of particles of random velocities and directions through a sphere of interaction around the radiator. It leads to correct statistics while traditional procedures with their reinjection prescriptions are shown to change the statistics. The new technique is applied to a detailed study of Ly-α. The influence of the shielding parameter and the temperature-density dependence are investigated. An asymptotic exponential falloff of the ion dipole autocorrelation function is exhibited, verifying analytic indications. The first joint ion-electron simulation of profiles is reported. They agree with the experimental profiles of Grützmacher and Wende.

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