Fresenius' Journal of Analytical Chemistry

, Volume 369, Issue 3, pp 320–327

LIBS using dual- and ultra-short laser pulses

Authors

  • S. M. Angel
    • Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • Dimitra N. Stratis
    • Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • Kristine L. Eland
    • Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • Tianshu Lai
    • Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • Mark A. Berg
    • Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC 29208, USA
  • David M. Gold
    • Medical Technology Program, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Special issue paper

DOI: 10.1007/s002160000656

Cite this article as:
Angel, S., Stratis, D., Eland, K. et al. Fresenius J Anal Chem (2001) 369: 320. doi:10.1007/s002160000656

Abstract

Pre-ablation dual-pulse LIBS enhancement data for copper, brass and steel using ns laser excitation are reported. Although large enhancements are observed for all samples, the magnitude of the enhancement is matrix dependent. Whereas all of the dual-pulse studies used ns laser excitation we see interesting effects when using ps and fs laser excitation for single-pulse LIBS. LIBS spectra of copper using 1.3 ps and 140 fs laser pulses show much lower background signals compared to ns pulse excitation. Also, the atomic emission decays much more rapidly with time. Because of relatively low backgrounds when using ps and fs pulses, non-gated detection of LIBS is shown to be very effective. The plasma dissipates quickly enough using ps and fs laser pulses, that high pulse rates, up to 1000 Hz, are effective for increasing the LIBS signal, for a given measurement time. Finally, a simple near-collinear dual-pulse fiber-optic LIBS probe is shown to be useful for enhanced LIBS measurements.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001