Langmuir probe investigation of transient plasmas generated by femtosecond laser ablation of several metals: Influence of the target physical properties on the plume dynamics

Irimiciuc, Ștefan Andrei; Gurlui, Silviu; Bulai, Georgiana; Nica, P.; Agop, M.; Focşa, Cristian

doi:10.1016/j.apsusc.2017.03.055

Cited by 29 publications

(36 citation statements)

References 47 publications

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“…Both melting point and cohesive energy are considered as a measure of the degree of volatility. The same dependence proposed by previously mentioned authors was also found by our group for fs-laser ablation of various metallic targets (W, Te, In, Cu, Ni, Mn, Al) [77]. The decrease of the ionic density with the increase of the melting point (or cohesive energy) appears to be a general characteristic of the laser-produced plasmas as it is confirmed by our current systematic study on the ns, fs and ps ablation for a wide range of metallic targets.…”

Section: Resultssupporting

confidence: 72%

“…As an example, for the experimental conditions in which the data from Figure 2 were registered [55], we have obtained v fast = 4.66 Â 10 4 m/s which is half of the previous value, as consequence of ion acceleration/oscillation in the probe electric field. Moreover, by smoothing the probe signal to remove the oscillations, the temporal trace is well described by a shifted Maxwellian velocity distribution function [83,84], with center-of-mass (or "drift") velocity in the range of 10 4 m/s [77].…”

Section: Resultsmentioning

confidence: 99%

“…Another approach used by our group is based on the treatment of the current-voltage characteristics (I-V plots) derived from the time-of-flight current profiles recorded at various probe biases and sampled at specific delays after the laser pulse [77]. In principle, this "classical" method [40,[91][92][93] considers only the thermal movement of the particles (without streaming) and a Maxwellian distribution function.…”

Section: Resultsmentioning

confidence: 99%

“…The values derived at t =1μs and d = 5 mm present a steep increase for low conductivity elements reaching a quasi-saturation regime after 10 MS/m. The experimental data were fitted with the same function [77] for the three ablation regimes:…”

Section: Resultsmentioning

confidence: 99%

“…The electric diagnostics mainly used were Langmuir probes immersed at various positions in the plasma plume to record the ionic or electronic currents, depending on the probe biasing voltage (V P ) [52,53,55,58,60,77,79]. Using bunches of Langmuir probes we obtained the angular distribution of charge carriers at various distances from the target [52].…”

Section: Laser Ablation -From Fundamentals To Applicationsmentioning

confidence: 99%

See 4 more Smart Citations

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

Nica¹,

Irimiciuc²,

Agop³

et al. 2017

Laser Ablation - From Fundamentals to Applications

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During the last decade, our groups have performed systematic experimental studies on the characterization of plasma plumes generated by laser ablation in various temporal regimes (ns, ps, fs) on materials ranging from simple metals (Al, Cu, Mn, Ni, In, W, …) to more complex compounds (ceramics, chalcogenide glasses, ferrites). Optical (fast imaging and space-and time-resolved emission spectroscopy) and electrical (mainly Langmuir probe) methods have been applied to experimentally investigate the dynamics of the plasma plume and its constituents. Influence of the target physical (thermodynamic and electrical) parameters on the plasma dynamics has been studied. A mathematical correlation between the local and global plasma parameters and the physical properties of the target was proposed for the first time. Peculiar behaviors like plume splitting or plasma oscillations have been evidenced for high laser fluence ablation in vacuum. Along with results from the literature, our findings provide convincing arguments for the existence of multiple double-layers in the laser ablation plasma plume, in a scenario including two-temperature electrons. New fractal-based theoretical approaches have been developed to qualitatively and quantitatively account for the observed phenomena. The space and time evolution of expansion velocity, particle number, current density and plasma temperature were theoretically investigated.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Laser Ablation -From Fundamentals To Applicationsmentioning

confidence: 99%

See 3 more Smart Citations

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

Nica¹,

Irimiciuc²,

Agop³

et al. 2017

Laser Ablation - From Fundamentals to Applications

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Insight into the plasma oxidation process during pulsed laser deposition

Irimiciuc

Chertopalov

Bulı́ř

et al. 2021

Plasma Processes & Polymers

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The dynamics of transient plasmas generated by ns laser ablation of Ag targets under various O 2 gas pressures (10 −5 -10 Pa) were investigated by implementing angle-and time-resolved Langmuir probe (LP) analysis and space-and timeresolved optical emission spectroscopy (OES). The effects of an O 2 atmosphere on silver oxide formation and the ionic kinetics and the overall plasma energy were systematically investigated. Measurements performed in the LP floating regime revealed the presence of three-ionic structures with kinetic energies varying from 0.8 to 350 eV, which can be tailored by the addition of O 2 . The timemodulated regime of electron temperature in the 0.5-3 eV observed for pressures higher than 2 Pa of O 2 could be explained by the formation and dissociation of silver oxide molecules. The energetic balance sustains molecular oxide formation, as confirmed by OES measurements, which revealed emission signatures of AgO (B 2 Π 3/2 and X 2 Π 3/2 ) in the 350 nm (B 2 Π 3/2 ) and 460 nm (X 2 Π 3/2 ) spectral regions. Finally, thin films were deposited to understand the range of possibilities offered by pulsed laser deposition of Ag in O 2 . The morphology and atomic structure of the films were analysed for large-scale deposition. Silver oxides were detected in the films starting from 2 Pa, while at higher values, we found mixtures of different Ag x O y phases. A cauliflower-like morphology was dominant above 5 Pa of O 2 atmosphere pressures, which signals the formation of the AgO phase in the deposited film. Our results demonstrate that the properties of deposited thin films are influenced by plasma properties.

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Influence of laser-produced plasma parameters on the deposition process: in situ space- and time-resolved optical emission spectroscopy and fractal modeling approach

et al. 2018

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Langmuir probe investigation of transient plasmas generated by femtosecond laser ablation of several metals: Influence of the target physical properties on the plume dynamics

Cited by 29 publications

References 47 publications

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

Insight into the plasma oxidation process during pulsed laser deposition

Influence of laser-produced plasma parameters on the deposition process: in situ space- and time-resolved optical emission spectroscopy and fractal modeling approach

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