Abstract
YukawaLaboratory ofBeam Technology, Nagaoka University of TechnologyNagaoka, Niigata 94O21, JapanC. Grigoriu, I. Chis, A. Marcu* and D. MiuNational Institute for Laser, Plasma and Radiation Physics, Laser DepartmentBucharest-Magurele, P. 0. Box MG 36, RomaniaABSTRACTNanosize powders ofAN was successfully synthesized by pulsed laser ablation. The target can beeither Ai or M'T, with ambient gas nitrogen. With Al targets, typical powder diameters were in the rangeof 2.5÷25 nm. In order to study the process ofpowder formation, we have used a high-speed camera anda time-resolved spectrum analyzing system to investigate the behaviour ofthe ablation plasma and the ionspecies in the plasma. For the diagnostic experiments, the target was Al and the ambient gas was oxygen.Keywords: nanosize powder, pulsed laser ablation, aluminum nitride, ablation plasma, plasmaspectroscopy, highspeed photography, ceramics, specific surfacearea1. INTRODUCTIONNanosize powders have a very large specific surface area. For this reason, nanosize powders of
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