Related Experiment Video
Updated: Feb 27, 2026
07:34
Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals
Published on: August 22, 2019
8.5K
From Spectral Interference to Overlapped Features: A Full-Spectrum LIBS Voigt Decomposition Strategy with Shoulder
Panyang Dai1, Peichao Zheng2, Jinmei Wang2
1School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.
Analytical Chemistry
|February 26, 2026
Summary
A new Laser-Induced Breakdown Spectroscopy (LIBS) method uses Voigt decomposition to resolve overlapping spectral lines, improving quantitative analysis of complex alloys by accurately identifying weak or shoulder-like spectral features.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Materials Science
Background:
- Laser-Induced Breakdown Spectroscopy (LIBS) offers rapid elemental analysis but suffers from spectral interference and overlapping features due to line crowding and plasma broadening.
- This interference significantly degrades the quantitative performance of LIBS analysis, especially for complex alloys.
Purpose of the Study:
- To develop a robust full-spectrum Voigt decomposition strategy to overcome spectral interference and overlapping features in LIBS.
- To enhance the quantitative accuracy and reliability of LIBS analysis for complex materials.
Main Methods:
- A novel strategy combining shoulder detection with residual-based line completion for full-spectrum Voigt decomposition.
- Segmentation of spectra into regions of interest (ROIs) using line lists and instrumental resolution.
- Constrained multicomponent Voigt fitting with statistically guided residual analysis to identify and recover weak or shoulder-like spectral lines.
Main Results:
- Demonstrated improved separation of overlapped spectral features in both synthetic and experimental LIBS data.
- Achieved a reduced relative standard deviation of line intensities, indicating more precise measurements.
- Showcased enhanced correlations between spectral line intensities and elemental concentrations, validating improved quantitative accuracy.
Conclusions:
- The proposed Voigt decomposition strategy effectively addresses spectral interference and overlapping features in LIBS.
- This physically grounded framework offers a scalable solution for accurate quantitative analysis of complex alloys using LIBS.
- The method enhances the overall performance and reliability of LIBS for materials characterization.
Related Concept Videos
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
1.9K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.9K
01:10Reconstruction of Signal using Interpolation
785
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
785
01:20Deconvolution
639
Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
639
01:26Linear Approximation in Frequency Domain
407
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
407
01:05Difference from Background: Limit of Detection
8.6K
The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
The LOD indicates the presence or absence...
8.6K
01:12Double Resonance Techniques: Overview
820
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
820