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Trace analysis of rubidium hyperfine structure in a flame atomizer using sub-Doppler laser wave-mixing spectroscopy
Kenneth M Weed1, William G Tong
1Department of Chemistry, San Diego State University, San Diego, California 92182, USA.
Applied Spectroscopy
|December 23, 2003
Summary
Nonlinear laser wave mixing achieves trace elemental analysis with sub-Doppler spectral resolution. This method, using a non-planar setup, reports a 0.05 ng/mL detection limit for Rubidium (Rb) in flame analysis.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Laser Physics
Background:
- Nonlinear laser wave mixing is a powerful spectroscopic technique.
- High spectral resolution is crucial for trace elemental analysis.
- Sub-Doppler spectral resolution enables detailed measurements of isotopic and hyperfine structures.
Purpose of the Study:
- To investigate the application of nonlinear laser wave mixing for trace elemental analysis.
- To evaluate the advantages of a non-planar wave-mixing optical setup.
- To achieve high spectral resolution and low detection limits for elements in analytical flames.
Main Methods:
- Utilized nonlinear laser wave mixing, specifically an absorption-based approach.
- Employed a non-planar optical setup for improved signal collection and alignment.
- Performed analysis using an air/acetylene flame.
Main Results:
- Achieved sub-Doppler spectral resolution for the infrared 780.0-nm Rubidium (Rb) transition line.
- Reported a detection limit of 0.05 ng/mL (50 parts-per-trillion) for Rb.
- Demonstrated the effectiveness of the non-planar wave-mixing setup.
Conclusions:
- Nonlinear laser wave mixing, particularly with a non-planar setup, is highly effective for trace elemental analysis.
- The method allows for high spectral resolution and sensitive detection of elements like Rb in flames.
- This technique holds promise for advanced isotopic and hyperfine structure measurements.
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