Resonance-enhanced laser-induced plasma spectroscopy for sensitive elemental analysis: Elucidation of enhancement mechanisms S. L. Lui and N. H. Cheunga) Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China ͑Received 4 September 2002; accepted 30 October 2002͒When performing laser-induced plasma spectroscopy for elemental analysis, the analytesignal-to-noise
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