Studies on the ns-IR-Laser-Induced Plasma Parameters in the Vanadium Oxide

Sarkar, Arnab; Shah, Raju V.; Alamelu, D.

doi:10.1155/2011/504764

Cited by 18 publications

(16 citation statements)

References 15 publications

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“…(Shaikh et al, 2006b;Hanif et al, 2013). The optimization of these parameters helps to understand the complex ablation mechanisms and control growth of structures (Sarkar et al, 2011). The presence of plasma strongly affects the ablation process and plays a key role for surface modification of the irradiated target.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

et al. 2014

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The effect of laser-irradiance on the surface morphology and laser induced breakdown spectroscopy of zinc has been investigated by employing Nd:YAG laser (wavelength λ = 1064 nm, pulse duration t ~ 10 ns, and repetition rate = 10 Hz) under ambient environment of argon at a pressure of 20 Torr. For this purpose, zinc targets were exposed to various laser irradiances ranging from 13 GW/cm2 to 100 GW/cm2. Scanning electron microscope analysis has been performed to analyze the surface modification of irradiated zinc targets. Scanning electron microscope analysis revealed the formation of various kinds of structures such as ripples, cones, cavities, and wave like ridges at the center and peripheral regions of ablated zinc. In the central ablated region with increasing laser irradiance, the growth of distinct and well defined ripples is observed. Further increase in irradiance makes the appearance of these ripples diffusive and narrow. In order to correlate the plasma parameters with the surface modification, laser induced breakdown spectroscopy analysis has also been performed. The electron temperature and number density of zinc plasma have been evaluated at various laser irradiances. For both plasma parameters, an increasing trend up to a certain value of laser irradiance is observed which is due to enhanced energy deposition. Afterword a decreasing trend is achieved which is attributed to the shielding effect. With further increase in irradiance a saturation stage comes and almost no change in plasma parameters is observed. This saturation is explainable on the basis of the formation of a self-regulating regime near the target surface. A strong correlation between surface modification and plasma parameters is established.

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Section: Introductionmentioning

confidence: 99%

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

et al. 2014

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“…Furthermore, at a particular time delay, higher laser energy, leads to higher temperature and density. This is due to the fact that electrons gain energy from laser beam via inverse Bremsstrahlung process (IB) (Sarkar et al, 2011). The decay of electron density drop (dn e /dt) is much faster than the rate of temperature (dT/dt).…”

Section: Plasma Parameters Versus Time Delaymentioning

confidence: 99%

“…This emphasizes that the radiative emission is dominant and the n e is initially very high. Therefore, data acquisition at proper time delay is essential to obtain good signal (Sarkar et al, 2011).…”

Section: Plasma Parameters Versus Time Delaymentioning

confidence: 99%

Radon decay monitoring in air using characteristic emission of species in metal-assisted LIBS

Moosakhani

Parvin

Majdabadi

et al. 2016

Radiation Measurements

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“…It depends on the assumption that optically thin plasma is produced which is in local thermodynamic equilibrium (LTE). Under this assumption, the following relation prevails in the plasma [29]:…”

Section: Calibration Curvesmentioning

confidence: 99%

Analysis of barium borosilicate glass matrix for uranium determination by using ns-IR-LIBS in air and Ar atmosphere

Sarkar¹,

Mishra²,

Kaushik³

et al. 2014

Radiochimica Acta

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In this paper, an attempt to explore the use of laser induced breakdown spectroscopy (LIBS) technique for determination of uranium in the vitrified simulated high level barium borosilicate waste glass matrix was made with a commercial portable LIBS system. The emission spectrum of the waste glass being very complex, detailed study was done for proper choice of the emission lines. Investigations were carried out to optimize the experimental parameters like laser energy and acquisition delay time for the analysis. Calibration curves were obtained for two emission lines of U in these glasses. Effect of Ar atmosphere was also studied and the signal intensity was found to be ∼5 times higher than in air atmosphereThe emission lines used for normalization with vast difference in the upper energy level compared to the line of interest were found to give poor precision in air. In the Ar atmosphere, this effect was found to be much less significant and such emission lines can be used as an internal standard to achieve precise calibration curves. LIBS approach will be useful for real time determination of U in such samples, eliminating quantitative dissolution step required in many other analytical techniques like solution based ICP-MS/OES.

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Studies on the ns-IR-Laser-Induced Plasma Parameters in the Vanadium Oxide

Cited by 18 publications

References 15 publications

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

Radon decay monitoring in air using characteristic emission of species in metal-assisted LIBS

Analysis of barium borosilicate glass matrix for uranium determination by using ns-IR-LIBS in air and Ar atmosphere

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