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12 - Resonance-enhanced LIBS

Published online by Cambridge University Press:  08 August 2009

By
N. H. Cheung
Edited by
Andrzej W. Miziolek ,
Vincenzo Palleschi  and
Israel Schechter
N. H. Cheung
Affiliation:
Department of Physics, Hong Kong Baptist University, People's Republic of China
Andrzej W. Miziolek
Affiliation:
U.S. Army Research Laboratory, USA
Vincenzo Palleschi
Affiliation:
Istituto per I Processi Chimico-Fisici, Italy
Israel Schechter
Affiliation:
Technion - Israel Institute of Technology, Haifa
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Summary

Introduction to resonance-enhanced LIBS

An analytical technique based on resonance-enhanced laser-induced plasma spectroscopy is reviewed in this chapter. The technique differs from conventional LIBS in that the plasmas are formed and heated by photoresonant excitation of the host species in the plume. The chaotic explosion and intense continuum emissions associated with thermal breakdown are therefore avoided. Pilot cases of solid and liquid analysis are discussed. The key experimental parameters are identified, the plasma dynamics are explained, and the improvements over non-resonant LIBS are reported. For solid samples, the ratio of the analyte line signal to the background continuum noise increased by an order of magnitude typically. For aqueous samples, the relative limits of detection (LODs) improved by 20× to 1000× for the range of elements tested. The absolute LODs were low enough to enable the measurement of Na and K in single human erythrocytes.

Laser-induced breakdown spectroscopy (LIBS) is a versatile technique for elemental analysis. While it is finding niche applications where alternative technology is inferior or simply does not exist, it is also challenged with ever more difficult analytical tasks (numerous examples of which can be found elsewhere in this book). Among the many problems encountered, some are specific and require solutions tailored for the particular application. But there are also general problems, such as the reproducibility and sensitivity issues associated with LIBS analysis.

The universality of the problem arises from the very nature of laser-induced breakdown.

Type
Chapter
Information
Laser Induced Breakdown Spectroscopy , pp. 440 - 476
Publisher: Cambridge University Press
Print publication year: 2006

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