Berlin 2001 – scientific programme

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P: Plasmaphysik

P 10: Theory and Plasma Diagnostic (Poster Session)

P 10.22: Poster

Wednesday, April 4, 2001, 12:30–15:00, AT2

Rayleigh scattering and resdistribution of radiation due to electron-atom collisions in the singlet and triplet system of HeI — •P. Drepper, S. Maurmann, S. Ferri, and H.-J. Kunze — Institut für Experimentalphysik V, Ruhr-Universität Bochum

Rayleigh scattering and redistribution of radiation is observed by using a dye laser pumped by an excimer laser for two singlet and three triplet transitions in a helium plasma, which is produced in a magnetic multipole plasma source. Running the plasma source continuously produces a plasma with electron temperatures 2 eV ≤ kT_e ≤ 7 eV and electron densities 10¹¹ cm⁻³≤ n_e≤ 10¹³ cm⁻³ at helium filling pressures 1 Pa ≤ p_g ≤ 5 Pa. Redistribution measurements provide information about electron-atom interactions in the plasma. We present here results of redistribution measurements as well as a comparison with theory; good agreement is found.