A severely overlapped-spectra decomposition approach for plasma emission spectroscopy
Jianxun Ji1, Weiran Song1, Zongyu Hou2
1State Key Lab of Power Systems, International Joint Laboratory on Low Carbon Clean Energy Innovation, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China.
Talanta
|March 5, 2026
Summary
A new method, center-wavelength coupled with broadening-width-ratio constrained decomposition (CC-BCD), resolves severely overlapped spectral peaks using low-resolution spectrometers. This technique significantly lowers the limit of detection (LOD) for elemental analysis in materials science.
Area of Science:
- Spectroscopy
- Analytical Chemistry
- Materials Science
Background:
- Decomposing severely overlapped spectra is a major challenge in spectroscopy due to limited spectral resolution.
- Ultra-high-resolution spectrometers can resolve overlaps but are costly and have high limits of detection (LOD).
- Low-resolution spectrometers offer cost and signal advantages but struggle with spectral overlap.
Purpose of the Study:
- To develop a method for accurately decomposing severely overlapped spectral peaks using low-resolution spectrometers.
- To improve the limit of detection (LOD) for elemental analysis in complex matrices.
- To enable high-resolution capabilities in cost-effective spectroscopic instruments.
Main Methods:
- Proposed a center-wavelength coupled with broadening-width-ratio constrained decomposition (CC-BCD) method.
- Assumes measured spectrum is a convolution of real plasma emission and instrumental response.
- Incorporates constraints from ultra-high-resolution spectra (central wavelengths, broadening width ratios) into the decomposition model.
Main Results:
- Successfully resolved completely overlapped peaks (U II and Fe I) in laser-induced breakdown spectroscopy (LIBS) for uranium ore analysis, reducing LOD to 7.3 mg/kg.
- Resolved severely overlapped peaks (Zn I and Cu I) in spark-discharge optical emission spectroscopy (SD-OES) for brass sample detection, lowering Zn LOD from 0.39 wt% to 0.11 wt%.
- Demonstrated that CC-BCD enables low-resolution spectrometers to achieve high resolution and sensitivity comparable to expensive ultra-high-resolution systems.
Conclusions:
- The CC-BCD method effectively resolves severely overlapped spectral lines using low-resolution spectrometers.
- This approach significantly enhances sensitivity and lowers LOD, offering a cost-effective alternative for elemental analysis.
- The method is applicable to various plasma emission spectroscopy techniques, including LIBS and SD-OES, for analyzing complex samples.
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