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30 Dec 2002

Volume 81, Issue 27, pp. 5099-5257

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Resonance-enhanced laser-induced plasma spectroscopy for sensitive elemental analysis: Elucidation of enhancement mechanisms

S. L. Lui and N. H. Cheung

Appl. Phys. Lett. 81, 5114 (2002); http://dx.doi.org/10.1063/1.1532774 (3 pages) | Cited 9 times

Online Publication Date: 19 December 2002

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When performing laser-induced plasma spectroscopy for elemental analysis, the analyte signal-to-noise ratio increased from four to over fifty if the plume was reheated by a dye laser pulse tuned to resonant absorption. Time-resolved studies showed that the enhancement was not due to resonance photoionization. Rather, efficient and controlled rekindling of a larger plume volume was the key mechanism. The signal-to-noise ratio further increased to over a hundred if the atmosphere was replaced by a low-pressure heavy inert gas. The ambient gas helped confine and thermally insulate the expanding vapor. © 2002 American Institute of Physics.
Show PACS
82.80.Dx Analytical methods involving electronic spectroscopy
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
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