Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 25, Issue 8, Pages 1316-1323Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c003304a
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Funding
- US ARO-MURI [W911NF-06-1-0446]
- State of Florida
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A new Laser-Induced Breakdown Spectroscopy (LIBS) enhancement method utilizing interaction between microwave radiation and laser-induced plasma has been evaluated. Experimental parameters such as laser pulse irradiance, microwave duration, and surrounding gas were studied and optimized for the microwave effect through a series of experiments on a piece of alumina ceramic sample. Up to 33 times enhancement on different spectral lines was achieved. Enhancement of the line intensity was found to be at a maximum when the laser ablation was induced at low irradiance on a large area in normal atmosphere. The enhancement was element-dependent and stronger for transitions with low excitation energy. The microwave enhancement in argon atmosphere was not as effective as in air, and the reasons are discussed.
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