Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 29, Issue 3, Pages 571-577Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ja50348h
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Funding
- National Science Foundation as part of the Plasma-Analyte Interaction Working Group (PAIWG) [CHE-0822469]
- University of Florida
- Federal Institute of Materials Research and Testing (BAM) in Berlin
- Institute for Analytical Sciences (ISAS) in Dortmund
- NSF
- DFG
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Powerchip lasers provide short, reproducible ablation pulses at rates in excess of a kilohertz, but the pulse to pulse jitter resulting from their passive Q-switches has prevented previous intra-pulse gated measurements. We have performed time-resolved measurements of the analytical figures of merit for the powerchip LIBS determination of copper in aluminum under air, argon and helium atmospheres. Minimum limits of detection were measured 25-125 ns after ablation and were as much as 15x better than the ungated values. These optimal delays would not require an optical delay line in most cases as a result of the short insertion delay of modern ICCDs. Argon cover gas was found to improve LODs slightly. Using gated detection, 1064 nm laser ablation and argon cover gas, we calculate a LOD as low as 0.65 ppm of copper.
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