Aachen PK 2003 – scientific programme

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P: Plasmaphysik

P 10: Poster II

P 10.31: Poster

Tuesday, March 18, 2003, 17:30–19:15, Foyer

Investigations of neon plasmas with admixtures of hydrogen in ECR and ICP reactors — •M. Regler, U. Fantz, and K. Behringer — Lehrstuhl für Experimentelle Plasmaphysik, Institut für Physik, Universität Augsburg, Universitätsstr. 1, D -86135 Augsburg

In order to investigate population processes in neon, optical emission spectroscopy is applied to determine population densities of some selected electronically excite states. The influence of the plasma parameters on the population process is obtained by using different types of discharges. The ECR source operates in a small pressure range (2–20 Pa) with a n_e=10¹⁷ m⁻³ and a Maxwellian distribution function for the electrons (T_e=2–4 eV). The planar ICP source is characterised by deviations from a Maxwell distribution, the electron density (10¹⁶–10¹⁸ m⁻³) can be varied by the input power. The wide variation in pressure (0.5–100 Pa) allows to demonstrate the influence of heavy particle collisions. Furthermore, the effect of admixtures of hydrogen on the neon populations is studied. A comparison of different neon/hydrogen mixtures to pure neon plasmas will be given and possible additional population mechanism will be discussed.