Authors: Galbács, G.¹; Jedlinszki, N.²; Herrera, K.³; Omenetto, N.³; Smith, B.W.³; Winefordner, J.D.³

Source: Applied Spectroscopy, Volume 64, Issue 2, Pages 36A-62A and 141-243, (February 2010) , pp. 161-172(12)

Publisher: Society for Applied Spectroscopy

Abstract:

Multi-pulse laser-induced breakdown spectroscopy (LIBS) in the collinear pulse configuration with time-integrating detection was performed on metallic samples in ambient air in an effort to clarify the contributing processes responsible for the signal enhancement observed in comparison with single-pulse excitation. Complementary experiments were also carried out on another LIBS setup using detection by an imaging spectrograph with high time resolution. The effects of laser bursts consisting of up to seven ns-range pulses from Nd-doped solid-state lasers operating at their fundamental wavelength and separated by 8.5-50 μs time gaps was studied. The ablation and emission characteristics of the generated plasmas were investigated using light profilometry, microscopy, plasma imaging, emission distribution mapping, time-resolved line emission monitoring, and plasma temperature calculations. The experimental data suggest that the two contributing processes mainly responsible for the signal enhancement effect are the plume reheating caused by the sequential laser pulses and, more dominantly, the increased material ablation attributed to the lower breakdown threshold for the preheated (molten) sample surface and/or the reduced background gas pressure behind the shockwave of preceding pulses.

Keywords: LASER-INDUCED BREAKDOWN SPECTROSCOPY; LIBS; LASER-INDUCED PLASMA SPECTROSCOPY; LIPS; SIGNAL ENHANCEMENT; LASER ABLATION

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370210790619609

Affiliations: 1: University of Szeged, Department of Inorganic and Analytical Chemistry, Dóm tér 7, H-6720 Szeged, Hungary. galbx@chem.u-szeged.hu 2: University of Szeged, Department of Inorganic and Analytical Chemistry, Dóm tér 7, H-6720 Szeged, Hungary 3: University of Florida, Department of Chemistry, PO Box 117200, Gainesville, Florida 32611-7200

Publication date: 2010-02-01

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