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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

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Laser-induced breakdown spectroscopy enhanced by a micro torch.

L Liu, X Huang, S Li

|June 16, 2015

Summary

A butane micro torch enhances plasma optical emissions in laser-induced breakdown spectroscopy (LIBS). This cost-effective method improves signal-to-noise ratios and detection sensitivity, especially at lower laser energies.

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Area of Science:

Analytical Chemistry
Spectroscopy
Plasma Physics

Background:

Laser-induced breakdown spectroscopy (LIBS) is a powerful analytical technique.
Enhancing plasma optical emissions is crucial for improving LIBS sensitivity and detection limits.
Existing methods may require high laser pulse energies, limiting applicability.

Purpose of the Study:

To investigate the use of a butane micro torch to enhance plasma optical emissions in LIBS.
To analyze the effects of the micro torch on plasma evolution, optical emission intensity, and signal-to-noise ratios (SNRs).
To evaluate the impact of laser pulse energy on micro torch-enhanced LIBS performance and detection limits.

Main Methods:

Utilized a commercial butane micro torch in conjunction with LIBS.
Employed fast imaging and spectroscopic analyses to observe plasma dynamics.
Studied optical emission intensities and SNRs as functions of delay time and laser pulse energy.
Generated calibration curves to determine elemental detection sensitivities and limits of detection.

Main Results:

The butane micro torch significantly enhanced plasma optical emissions and SNRs.
Similar spectral intensities were achieved with lower laser pulse energies when using the micro torch.
Higher SNR enhancement factors were observed at lower laser pulse energies.
Detection sensitivities for Mn and V were improved approximately threefold, with reduced limits of detection.

Conclusions:

The micro torch is a cost-effective and compact addition to LIBS systems.
It effectively improves sensitivity and detection limits, particularly for systems operating at low laser pulse energies.
This approach offers a practical solution for enhancing LIBS performance in various applications.