Comparative investigation of laser ablation plumes in air and argon by analysis of spectral line shapes: Insights on calibration-free laser-induced breakdown spectroscopy

We investigated the time evolution of pressure in the plume generated by laser ablation with ultraviolet nanosecond laser pulses in a near-atmospheric argon atmosphere. These conditions were previously identified to produce a plasma of properties that facilitate accurate spectroscopic diagnostics. Using steel as sample material, the present investigations benefit from the large number of reliable spectroscopic data available for iron. Recording time-resolved emission spectra with an echelle spectrometer, we were able to perform accurate measurements of electron density and temperature over a time interval from 200 ns to 12 µs. Assuming local thermodynamic equilibrium, we computed the plasma composition within the ablated vapor material and the corresponding kinetic pressure. The time evolution of plume pressure is shown to reach a minimum value below the pressure of the background gas. This indicates that the process of vapor-gas interdiffusion has a negligible influence on the plume expansion dynamics in the considered timescale. Moreover, the results promote the plasma pressure as a control parameter in calibration-free laser-induced breakdown spectroscopy.

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“…In addition to the number densities of plasma species, the calculated kinetic pressure [Eq. (5)] is displayed in Fig. 5.…”

Section: Characterization Of Pressure Evolution 421 Determination mentioning

confidence: 99%

“…In a molecular gas, such as ambient air, inelastic collisions play a significant role in the vapor-gas interaction. The energy loss at the vapor-gas contact front leads to the formation of a cold peripheral layer within the vaporized material [5]. The situation is different for ablation in an inert gas.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of pressure in a plasma produced by laser ablation of steel

Hermann

Axente

Crăciun

et al. 2018

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Although laser parameters such as laser fluence, wavelength and pulse duration are important for controlling the process, the ablation environment determines to a large extent the laser-material interaction [21,22]. In this sense, the ablation process seems to be more productive in open air than in argon.…”

Section: Ablation Ratementioning

confidence: 99%

“…As can be seen, copper nanoparticles obtained by the IR-Picosecond laser in argon present the Close inspection of Figure 6 reveals that the sizes of the obtained nanoparticles are deeply determined by the nucleation time and the growth time of nuclei. In this growth kinetics, parameters such as fluence, wavelength and the repetition rate of the laser source, but also the environmental conditions, are critical factors [21,23].…”

Section: Size and Morphologymentioning

confidence: 99%

“…These results bring to light the great influence of the atmosphere on the ablation process. In argon, the absorption of the laser beam by the plasma is higher than in air, and consequently, less of the sample is vaporized [21]. On the other hand, the broad size dispersion is due to the presence of large particles from the material ejection during the laser ablation process.…”

Section: Size and Morphologymentioning

confidence: 99%

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Fabrication and Deposition of Copper and Copper Oxide Nanoparticles by Laser Ablation in Open Air

et al. 2020

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The proximity of the "post-antibiotic era", where infections and minor injuries could be a cause of death, there are urges to seek an alternative for the cure of infectious diseases. Copper nanoparticles and their huge potential as a bactericidal agent could be a solution. In this work, Cu and Cu oxide nanoparticles were synthesized by laser ablation in open air and in argon atmosphere using 532 and 1064 nm radiation generated by nanosecond and picosecond Nd:YVO 4 lasers, respectively, to be directly deposited onto Ti substrates. Size, morphology, composition and the crystalline structure of the produced nanoparticles have been studied by the means of field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), the energy dispersive spectroscopy of X-rays (EDS), selected area electron diffraction (SAED) and X-ray diffraction (XRD). The UV-VIS absorbance of the thin layer of nanoparticles was also measured, and the antibacterial capacity of the obtained deposits tested against Staphylococcus aureus. The obtained deposits consisted of porous coatings composed of copper and copper oxide nanoparticles interconnected to form chain-like aggregates. The use of the argon atmosphere contributed to reduce significantly the formation of Cu oxide species. The synthesized and deposited nanoparticles exhibited an inhibitory effect upon S. aureus.

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LIBS Analysis of Optical Surfaces and Thin Films

Gerhard¹,

Hermann

2023

Laser Induced Breakdown Spectroscopy (LIBS)

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Comparative investigation of laser ablation plumes in air and argon by analysis of spectral line shapes: Insights on calibration-free laser-induced breakdown spectroscopy

Cited by 37 publications

References 46 publications

Evaluation of pressure in a plasma produced by laser ablation of steel

Evaluation of pressure in a plasma produced by laser ablation of steel

Fabrication and Deposition of Copper and Copper Oxide Nanoparticles by Laser Ablation in Open Air

LIBS Analysis of Optical Surfaces and Thin Films

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