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Updated: Jul 18, 2026
14:22
Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
Published on: April 12, 2014
Resonance fluorescence spectroscopy in laser-induced cavitation bubbles.
Sandra Koch1, Walter Garen, Walter Neu
1Photonics, Faculty of Technology, University of Applied Sciences Fachhochschule Oldenburg/Ostfriesland/Wilhelmshaven, Constantiaplatz 4, 26723, Emden, Germany. Sandra.Koch@fho-emden.de
Analytical and Bioanalytical Chemistry
|March 8, 2006
Summary
This study enhances laser-induced breakdown spectroscopy (LIBS) for trace element detection in water. Double-pulse laser excitation and resonant fluorescence significantly improve sensitivity and selectivity for indium detection.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Laser Physics
Background:
- Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for elemental analysis.
- LIBS in liquids presents challenges due to rapid plasma quenching and signal attenuation.
- Enhancing sensitivity and selectivity in liquid-phase LIBS is crucial for trace detection.
Purpose of the Study:
- To improve the detection limits and selectivity of laser-induced breakdown spectroscopy (LIBS) for trace elements in aqueous solutions.
- To investigate the synergistic effects of double-pulse laser excitation and resonant laser excitation in liquid LIBS.
- To optimize LIBS parameters for sensitive indium detection in water.
Main Methods:
- Utilized a double-pulse Q-switched Nd:YAG laser system (532 nm) to generate plasma in an indium-doped water suspension.
- Employed a secondary laser pulse timed to coincide with bubble expansion to minimize plasma quenching.
- Implemented resonant laser excitation via a fiber-guided dye laser to enhance fluorescence emission.
- Detected and processed resonance fluorescence using an intensified optical multichannel analyzer system.
Main Results:
- Achieved reliable trace detection limits for indium in water suspensions.
- Demonstrated significant enhancement in detection sensitivity through the combined double-pulse and resonant excitation approach.
- Showcased increased detection selectivity by leveraging resonant fluorescence.
- Successfully reduced plasma quenching effects with the optimized double-pulse strategy.
Conclusions:
- The developed double-pulse LIBS technique with resonant excitation offers a robust method for sensitive and selective trace element analysis in liquids.
- This approach significantly overcomes the limitations of conventional LIBS in aqueous environments.
- The findings pave the way for improved real-time monitoring of contaminants and elements in water samples.
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