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P: Plasmaphysik

P 17: Poster III

P 17.32: Poster

Thursday, March 20, 2003, 17:30–19:15, Foyer

Atomic Lithium Beam Spectroscopy for T_e and N_e in Low Temperature Plasmas — •M. Böke and J. Winter — Institut for Experimental Physics II, Ruhr-University Bochum, D-44780 Bochum

The emitted radiation of a thermal atomic H_α lithium beam and a pulsed lithium beam provided by laser ablation from a lithium target is used to obtain the density of the electrons and their mean kinetic energy. Using an intensified CCD camera in combination with a spectrograph the light emitted from neutral lithium atoms (excited through collisions with plasma electrons) is detected. The plasma parameters are obtained from appropriate line intensity ratios in comparison with a detailed collisional radiative model for the lithium states. Results are compared with probe measurements in rare gases. The characterization of the atomic lithium beam is done by LIF measurements with laser diodes. The discharge geometry is a modified GEC cell with planar bifilar inductive coupling.