Plasma plume photography and spectroscopy of Fe—Oxide materials |
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Authors: | R Viskup B Praher T Stehrer J Jasik H Wolfmeir JD Pedarnig J Heitz |
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Institution: | a Christian Doppler Laboratory for Laser - Assisted Diagnostics, Johannes Kepler University Linz, A-4040 Linz, Austria b Institute of Applied Physics, Johannes Kepler University Linz, A-4040 Linz, Austria c voestalpine Stahl GmbH, A-4031 Linz, Austria |
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Abstract: | Time-resolved photography was employed to study plasma dynamics and particle ejection of laser-irradiated iron oxide materials. Nano-particle powder, pressed powder pellets and sintered ceramics were ablated in air and Ar gas background by means of short laser pulses (Nd:YAG laser wavelength λ = 1064 nm and pulse duration τL ≈ 6 ns; KrF laser λ = 248 nm and τL ≈ 20 ns). Plasma plume dynamics significantly depended on sample morphology. The ejection of non-luminous particles up to several hundreds of microseconds after the laser pulse was observed for powder and pressed powder target materials. Laser-induced breakdown spectroscopy (LIBS) was employed for element analysis of iron oxide powders, pressed pellets and sintered ceramics. LIBS spectra of the different targets were comparable to each other and qualitatively independent of target morphology. |
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Keywords: | Pulsed-laser ablation Laser-induced breakdown spectroscopy Plasma plume photography Particle ejection Nano-powder Iron oxide |
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