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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
Chlorine analysis by diode laser atomic absorption spectrometry
1Institute of Spectrochemistry and Applied Spectroscopy (ISAS), Bunsen-Kirchhoff-Street 11, D-44139 Dortmund, Germany.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 5, 2003
Summary
Diode Laser Absorption Spectrometry (DLAAS) in low-pressure plasmas offers sensitive detection of non-metals. This study details a new DLAAS detector for halogen-specific analysis, achieving 10 pg detection limits for chlorine in polymers.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Plasma Physics
Background:
- Diode Laser Absorption Spectrometry (DLAAS) is effective for non-metal detection in low-pressure plasmas.
- Existing methods for halogen-specific analysis of volatile compounds and polymers have limitations.
Purpose of the Study:
- To recapitulate DLAAS characteristics for non-metal detection.
- To present a novel DLAAS detector for halogen-specific analysis in microwave-induced plasmas.
- To investigate the influence of hydrocarbons on plasma dissociation.
Main Methods:
- Utilized Diode Laser Absorption Spectrometry (DLAAS) in a microwave-induced low-pressure plasma.
- Employed a balanced-heterodyne detection scheme to suppress noise.
- Analyzed ablated polymer fragments and gas chromatographically separated hydrocarbons.
- Determined carbon-, chlorine-, and hydrogen-specific stoichiometry.
Main Results:
- Achieved a chlorine-specific absolute detection limit of 10 pg for polymer analysis.
- Demonstrated effective suppression of technical noise (laser excess, RAM noise).
- Found insignificant deviations in stoichiometry, suggesting internal standardization is possible.
Conclusions:
- The developed DLAAS detector is a viable alternative for halogen-specific analysis.
- The technique offers high sensitivity and noise reduction for complex samples.
- Internal standardization is feasible for plasma analysis based on elemental stoichiometry.
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