A review of laser-induced breakdown spectroscopy signal enhancement

Li, Yingchao; Tian, Di; Ding, Yu; Yang, Gye Mo; Liu, Ke; Wang, Chenghao; Han, Xu

doi:10.1080/05704928.2017.1352509

Cited by 122 publications

(50 citation statements)

References 191 publications

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“…There has been a wide interest to enhance the LIBS detection power by different methods. 44 The most successful approach involves excitation with a secondary plasma. Thus, double-laser pulse schemes, excitation with microwaves plasmas, sparks/arcs, glow-discharges, or modifications in the interrogated surface ( Figure 8) are found in the literature with significant success.…”

Section: Pushing the Sensitivity Of Libsmentioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy (LIBS): Fast, Effective, and Agile Leading Edge Analytical Technology

2018

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Section: Pushing the Sensitivity Of Libsmentioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy (LIBS): Fast, Effective, and Agile Leading Edge Analytical Technology

2018

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“…This is induced in part by the detector characteristics of the spectrometers and in part by the detectable optical emission (e.g., emission in the ultraviolet (UV) regime and in time scales that are very close to the temporal resolution of the CCD/ICCD detectors), which require a certain minimum of laser fluence and therefore limit the achievable spatial resolution for depth profiling experiments. To compensate for these disadvantages, much effort has been focused on developing new methods to enhance spectral emission intensity and plasma persistence by the implementation of, e.g., a double‐pulse (DP) laser system, 18–21 a high‐voltage electrical pulse, 22 a microwave, 23 or a glow discharge 16 excitation source in the LA process.…”

Section: Introductionmentioning

confidence: 99%

UV post‐ionization laser ablation ionization mass spectrometry for improved nm‐depth profiling resolution on Cr/Ni reference standard

Grimaudo

Tulej

Riedo

et al. 2020

Rapid Comm Mass Spectrometry

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Rationale Laser ablation combined with mass spectrometry forms a promising tool for chemical depth profiling of solids. At irradiations near the ablation threshold, high depth resolutions are achieved. However, at these conditions, a large fraction of ablated species is neutral and therefore invisible to the instrument. To compensate for this effect, an additional ionization step can be introduced. Methods Double‐pulse laser ablation is frequently used in material sciences to produce shallow craters. We apply double‐pulse UV femtosecond (fs) Laser Ablation Ionization Mass Spectrometry to investigate the depth profiling performance. The first pulse energy is set to gentle ablation conditions, whereas the second pulse is applied at a delay and a pulse energy promoting the highest possible ion yield. Results The experiments were performed on a Cr/Ni multi‐layered standard. For a mean ablation rate of ~3 nm/pulse (~72 nJ/pulse), a delay of ~73 ps provided optimal results. By further increasing the energy of the second pulse (5–30% higher with respect to the first pulse) an enhancement of up to 15 times the single pulse intensity was achieved. These conditions resulted in mean depth resolutions of ~37 and ~30 nm for the Cr and Ni layers, respectively. Conclusions It is demonstrated on the thin‐film standard that the double‐pulse excitation scheme substantially enhances the chemical depth profiling resolution of LIMS with respect to the single‐pulse scheme. The post‐ionization allows for extraordinarily low ablation rates and for quantitative and stoichiometric analysis of nm‐thick films/coatings.

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“…Laser induced breakdown spectroscopy (LIBS) has been utilized in various fields such as forensics [1][2][3], pharmaceuticals [4], military and security [5,6], environmental analysis [7][8][9], archeological analyses [10][11][12] and material processes to analyze the target samples both qualitatively and quantitatively [13][14][15][16]. In recent decades, the field of laser induced breakdown spectroscopy has gained great attention from scientists from the fields of material sciences, plasma physics and analytical chemistry [17][18][19] all over the world due to its numerous applications in analyzing the elemental compositions of samples from solids [20], liquids [21] and gasses [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Effect of Increasing Target Temperature and the Size of Cavity Confinements on Laser-Induced Plasmas

Yao

Asamoah

Wei

et al. 2020

Metals

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In this work, the effect of the sample temperature on the magnesium (Mg) and titanium (Ti) plasmas generated by a Q-switched Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser operating at its fundamental wavelength of 1064 nm has been investigated. We observed that increasing the sample temperature significantly enhanced the emission intensities of the plasmas. Comparing the emission peak intensities of the case of 100 °C to the case of 300 °C, we recorded a substantial enhancement of the peak intensities of the latter compared to the former. From these results it can be observed that increasing the sample temperature has a significant effect on the emission intensities of the plasmas. We also studied the plasma dynamics and found that increasing the sample temperature also decreases the air density around the Mg sample surface. The reduction in the air density resulted in a decrease in the radiation process and lowers collision probability. Furthermore, as the plasma expands, the plasma pressure also decreases. In addition, we also employed circular and square cavities to confine the titanium plasma, and investigated the effect of the sizes of the circular and square cavities on the titanium plasma. We observed a general improvement in the emission intensities with both the circular and square cavities and attributed this improvement to the plasma compression effect of the shock waves produced by the plasma within the cavities.

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A review of laser-induced breakdown spectroscopy signal enhancement

Cited by 122 publications

References 191 publications

Laser-Induced Breakdown Spectroscopy (LIBS): Fast, Effective, and Agile Leading Edge Analytical Technology

Laser-Induced Breakdown Spectroscopy (LIBS): Fast, Effective, and Agile Leading Edge Analytical Technology

UV post‐ionization laser ablation ionization mass spectrometry for improved nm‐depth profiling resolution on Cr/Ni reference standard

Investigation into the Effect of Increasing Target Temperature and the Size of Cavity Confinements on Laser-Induced Plasmas

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