Growth of titanium nanoparticles in confined plasma

Kumar, Bhupesh; Thareja, R. K.

doi:10.1063/1.3697978

Cited by 16 publications

(16 citation statements)

References 38 publications

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“…Several investigators used water layers above the target surface to produce plasmas confined between the solid-liquid interface. [43][44][45] The degree of confinement and the resulting influence on various plasma parameters depends on the thickness of the water layer in front of the expanding plasma plume. 46 It is reported that the electron density of a plasma plume produced at a solid-water interface has a value several orders of magnitude larger than that produced at solid-air interface or in vacuum as a consequence of its physical confinement.…”

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confidence: 99%

Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

et al. 2014

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Ion signals from laser produced plasmas (LPPs) generated inside aluminum rectangular cavities at a fixed depth d = 2 mm and varying width, x = 1.0, 1.6, and 2.75 mm were obtained by spatially varying the position of a negatively biased Langmuir probe. Damped oscillatory features superimposed on Maxwellian distributed ion signals were observed. Depending on the distance of the probe from the target surface, three to twelve fold enhancements in peak ion density were observed via confinement of the LPP, generated within rectangular cavities of varying width which constrained the plasma plume to near one dimensional expansion in the vertical plane. The effects of lateral spatial confinement on the expansion velocity of the LPP plume front, the temperature, density and expansion velocity of ions, enhancement of ion flux, and ion energy distribution were recorded. The periodic behavior of ion signals was analyzed and found to be related to the electron plasma frequency and electron-ion collision frequency. The effects of confinement and enhancement of various ion parameters and expansion velocities of the LPP ion plume are explained on the basis of shock wave theory.

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confidence: 99%

Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

et al. 2014

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“…Figure 8 shows the C 2 band sequence corresponding to Dv ¼ 1, 0, and À1. (4)(5) at 547 nm is shown in Figure 8(c). The temporal evolution of C 2 band sequence corresponding to Dv ¼ 1 is shown in Figure 9.…”

Section: -5mentioning

confidence: 93%

“…[1][2][3][4][5] Plume dynamics and plasma parameters, viz., electron density, electron temperature, velocity of expansion, etc. play an important role in optimization of plasma properties for various applications depending on the laser parameters like wavelength, pulse-width, and irradiance used including the thermo-physical properties of the target material and the ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Optical probe investigation of laser ablated carbon plasma plume in nitrogen ambient

Singh¹,

Gupta²,

Thareja³

2013

Physics of Plasmas

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We report the study of carbon plasma produced using 1064 nm laser in nitrogen ambient at atmospheric pressure using 2-dimensional fast imaging of ablated plume, optical emission spectroscopy, and optical probe at 532 nm for interferometry and shadowgraphy. The dominance of C 2 and CN molecules over ionic species at later stages of expanding carbon plasma plume is reported. The observed ring structure in shadowgrams and change in the direction of fringe shift from positive to negative in recorded interferograms are correlated with the relative abundance of different species in the plasma plume as function of time delay with respect to ablating pulse. An agreement in observed onset time of formation of clusters/atomic species or low ionic species using different diagnostic techniques has been reported. V C 2013 AIP Publishing LLC.

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“…The optical emission characteristics and the shock wave dynamics in laser induced plasmas have been investigated using spectroscopy, photography, shadowgraphy, and interferometric techniques in gases, liquids, and geometrical shapes. [18][19][20][21][22][23][24][25][26][27] Zeng et al investigated laser produced plasma confined in micromachined fused silica cavities. 22 Bhupesh et al reported a comparative study of shock wave dynamics and optical emission of titanium plasma in the liquid and gas ambients.…”

Section: Introductionmentioning

confidence: 98%

“…22 Bhupesh et al reported a comparative study of shock wave dynamics and optical emission of titanium plasma in the liquid and gas ambients. 23 Shen et al reported enhancement in emission intensity of aluminum atomic lines using plasma confinement between two plates. 14 Yeates et al reported superior plasma emission from the plasma-surface collisions in rectangular cavity and attributed this to forced recombination.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of laser-blow-off induced Li plume in confined geometry

2013

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Dynamics of Li plasma plume created by laser-blow-off technique in air ambient is reported. Plasma plume dynamics and its optical emission are investigated in planar and confined geometries using time resolved shadowgraph imaging and optical emission spectroscopy. Significant differences in the plasma characteristics in confined geometry are quantitatively investigated by comparing the plasma parameters (temperature and density) in free expansion and confined geometry configurations. Dynamics and physical parameters of the primary as well as the reflected shock waves (in confined geometry) and their interactions with expanding plasma are briefly addressed. A large enhancement in the emission intensities of Li I 610.3 nm (2p 2 P 1/2, 3/2 3d 2 P 3/2, 5/2 ) and 670.8 nm (2s 2 S 1/2 2p 2 P 1/2, 3/2 ) is correlated with the shock wave dynamics in the two geometries. Strong self reversal in the neutral emission infers an increase in the population density of neutrals within the confined plasma plume. V C 2013 AIP Publishing LLC.

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Growth of titanium nanoparticles in confined plasma

Cited by 16 publications

References 38 publications

Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas

Optical probe investigation of laser ablated carbon plasma plume in nitrogen ambient

Dynamics of laser-blow-off induced Li plume in confined geometry

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