Kiel 2004 – scientific programme

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P: Plasmaphysik

P 17: Postersitzung: Plasma-Wand-Wechselwirkung III, Grundlegende Probleme Theorie II, Schwerionen- Laserplasmen II, Dichte Plasmen II

P 17.10: Poster

Wednesday, March 10, 2004, 17:45–19:30, Foyer

Hyper-Thermic Atomic Hydrogen Beam Source for Surface Studies — •Tatiana Babkina, Timo Gans, and Uwe Czarnetzki — Institut für Plasma- und Atomphysik, Ruhr-Universität Bochum, Germany

The present report is concentrated on the design of and first investigations on a novel atomic hydrogen beam source. The source is based on neutralisation and reflection of hydrogen ions at surfaces. Ions are produced in a pulsed hydrogen RF discharge with magnetic confinement at pressures in the Pascal range. A voltage pulse is applied to a small electrode inside the discharge volume. Ions are accelerated in the sheath potential in front of the electrode. A hydrogen atom beam is produced by neutralisation and reflection of impinging ions at the electrode surface. The atom beam traverses the plasma collisionless and can be applied for detailed investigations of exothermic chemical reactions of hyper-thermic hydrogen atoms at metal surfaces. The atomic hydrogen beam is investigated by optical emission spectroscopy and an energy resolved mass spectrometer opposite to the electrode. Influences of ion species, ion energy, surface materials and threshold for neutralisation on the atomic beam characteristics can be studied. The project is funded by the DPG in the frame of the SFB 616.