Hannover 2016 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 3: Laser Applications and Laser Matter Interactions I

K 3.3: Vortrag

Dienstag, 1. März 2016, 15:30–15:50, f428

Influence of gas background and pressure on calibration-free analysis of multi-component oxides by laser-induced breakdown spectroscopy — •Josef Hechenberger¹, Simon Eschlböck-Fuchs¹, Norbert Huber¹, Roman Rössler², and Johannes D. Pedarnig¹ — ¹Institute of Applied Physics, Johannes Kepler University Linz, A-4040 Linz, — ²voestalpine Stahl GmbH, A-4031 Linz, Austria

Calibration-free Laser-induced breakdown spectroscopy (CF-LIBS) enables to determine the concentration of elements in a sample material without measuring reference samples. We investigate the influence of the background gas and gas pressure on the plasma parameters and the CF-LIBS analysis. Samples are slags from industrial steel production consisting of 7 major and minor oxides (CaO, Al2O3, MgO, SiO2, FeO, MnO, TiO2) with varying concentrations. Plasma is ignited on samples in a vacuum chamber with gas supply and pressure control by Nd:YAG laser ablation. The electron number density Ne and plasma temperature Te and the CF-LIBS calculated concentrations of oxides CCF are determined. Ne was derived from Stark-broadening of Mg I line and Te by Saha-Boltzmann plot method of Ca, Mn and Ti lines. The concentrations CCF were compared to nominal concentrations CN analyzed by X-Ray fluorescence (XRF). Our preliminary results indicate that multi-oxide samples can be CF-LIBS analyzed with similar relative errors in Martian-simulant atmosphere (approx. 7 mbar CO2) and air atmosphere (1 bar). Financial support by the Austrian Research Promotion Agency FFG (Project 838861) is acknowledged.