Investigations of Laser Produced Plasmas Generated by Laser Ablation on Geomaterials. Experimental and Theoretical Aspects

Enescu, Florin; Irimiciuc, Ștefan Andrei; Cimpoeşu, Nicanor; Bedelean, Horea; Bulai, Georgiana; Gurlui, Silviu; Agop, Maricel

doi:10.3390/sym11111391

Cited by 6 publications

(8 citation statements)

References 49 publications

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“…The above result shows that, according to [8,9,30], a synchronization through self-modulation in amplitudes between two entities of a complex system is established. Such experimental results are presented in [31][32][33]. All results previously presented show a new approach for describing dynamics of complex systems through the isomorphism of two SL(2R) type groups, one of the variables, and another of the initial conditions.…”

Section: Dynamics In a Complex System In The Form Of Schrödinger Typementioning

confidence: 76%

“…The velocity fields (69) and (70) induce the fractal minimal vortex (Figure 3). The previous results were used to describe the dynamics of laser ablation plasma [31]. Moreover, the existence of the fractal minimal vortex (71) could explain the turbulent behaviors of the laser ablation plasma and of the atmosphere.…”

Section: Dynamic Of Complex Systems In the Form Of Hydrodynamic Type mentioning

confidence: 99%

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Towards Stochasticity through Joint Invariant Functions of Two Isomorphic Lie Algebras of SL(2R) Type

Agop

Craus

2020

Symmetry

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In the motion fractal theory, the scale relativity dynamics of any complex system are described through various Schrödinger or hydrodynamic type fractal “regimes”. In the one dimensional stationary case of Schrödinger type fractal “regimes”, synchronizations of complex system entities implies a joint invariant function with the simultaneous action of two isomorphic groups of the S L ( 2 R ) type as solutions of Stoka type equations. Among these joint invariant functions, Gaussians become in the Jeans’s sense, probability density (i.e., stochasticity) whenever the information on the complex system analyzed is fragmentary. In the two-dimensional case of hydrodynamic type fractal “regimes” at a non-differentiable scale, the soliton and soliton-kink of fractal type of the velocity field generate the minimal vortex of fractal type that becomes the source of all turbulences in the complex systems dynamics. Some correlations of our model to experimental data were also achieved.

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Section: Dynamics In a Complex System In The Form Of Schrödinger Typementioning

confidence: 76%

Section: Dynamic Of Complex Systems In the Form Of Hydrodynamic Type mentioning

confidence: 99%

Towards Stochasticity through Joint Invariant Functions of Two Isomorphic Lie Algebras of SL(2R) Type

Agop

Craus

2020

Symmetry

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“…Let us further calibrate the multifractal model with respect to the experimental data presented in [5][6][7][8] and [16][17][18]. According to [7], (17) can be identified with the expansion velocity of the Coulomb plasma structure (V C ), while (18) is associated with the thermal plasma structure (−V T ), and ( 22) can be identified with the electron temperature.…”

Section: Insight Into Plasma Plume Energy Distributionmentioning

confidence: 99%

“…In Figure 4a, the theoretical dependence from (32) is plotted. By choosing adequate nondimensional variables and adopting a suitable interpretation of V D , Ω, and M, this dependence can describe the general empirical behavior reported in [5][6][7][8][12][13][14][15][16]. In Figure 4b, relation (35) is represented.…”

Section: Insight Into Plasma Plume Energy Distributionmentioning

confidence: 99%

Multifractal Model for Transient Phenomena Analysis in Laser Produced Plasmas

Irimiciuc

Agop

2021

Symmetry

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The pulsed laser deposition process is a complex one, encompassing a wide range of physical phenomena that act at different time scales, ranging from laser absorption to melting, plasma formation, and thin film deposition. In the past 15 years, there has been an exponential increase in theoretical models for different aspects of laser ablation phenomena, especially laser-produced plasmas. Among these. new types of models based on multifractal physics have been proposed. The models aim to describe the various dynamics reported for laser-produced plasmas in both the multifractal-type Schrodinger representation and in the multifractal-type hydrodynamic representation. The two approaches are complementary, as the Schrodinger representation uses operation procedures (invariance groups, variational principles, harmonic maps, etc.) while the hydrodynamic representation translates the dynamics of the laser-produced plasma into fluid motion of a multifractal type. The aim of this review is to report on the wide range of dynamics that can be discussed within the framework of a multifractal approach to plasma dynamics.

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“…where χ = χ(x) is the fractal stationary state function, E 0 is the fractal energy of the ablation plasma structural unit [22] and the m 0 is the rest mass of the same structural unit. The potential barrier in this case will differentiate between two possible states of the ejected particles in during the expansion (emissive and non-emissive).…”

Section: Theoretical Modelmentioning

confidence: 99%

Investigations of Transient Plasma Generated by Laser Ablation of Hydroxyapatite during the Pulsed Laser Deposition Process

et al. 2020

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The optimization of the pulsed laser deposition process was attempted here for the generation of hydroxyapatite thin films. The deposition process was monitored with an ICCD (Intensified Coupled Charged Device) fast gated camera and a high-resolution spectrometer. The global dynamics of the laser produced plasma showed a self-structuring into three components with different composition and kinetics. The optical emission spectroscopy revealed the formation of a stoichiometric plasma and proved that the segregation in the kinetic energy of the plasma structure is also reflected by the individual energies of the ejected particles. Atomic Force Microscopy was also implemented to investigate the properties and the quality of the deposited film. The presence of micrometric clusters was seen at a high laser fluence deposition with in-situ ICCD imaging. We developed a fractal model based on Schrödinger type functionalities. The model can cover the distribution of the excited states in the laser produced plasma. Moreover, we proved that SL(2R) invariance can facilitate plasma substructures synchronization through a self-modulation in amplitude.

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Investigations of Laser Produced Plasmas Generated by Laser Ablation on Geomaterials. Experimental and Theoretical Aspects

Cited by 6 publications

References 49 publications

Towards Stochasticity through Joint Invariant Functions of Two Isomorphic Lie Algebras of SL(2R) Type

Towards Stochasticity through Joint Invariant Functions of Two Isomorphic Lie Algebras of SL(2R) Type

Multifractal Model for Transient Phenomena Analysis in Laser Produced Plasmas

Investigations of Transient Plasma Generated by Laser Ablation of Hydroxyapatite during the Pulsed Laser Deposition Process

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