A spectroscopic analysis study of graphite using laser technique

Khalil, A. H.

doi:10.1134/s1054660x10010081

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…Applications of DP-LIBS for the analysis of alloys, ,,,, ceramics, , inorganic ,, and organic ,,,− materials, liquids (water solutions, ,, samples underwater , ), and aerosols have been reported. DP-LIBS has been applied for the determination of heavy and toxic metals (Pb) in soils and to improve the detection of S in coal .…”

Section: Libs Methodsmentioning

confidence: 99%

“…313 Also, sensitivity was improved using a double-pulse configuration to re-excite the expanding plume created by the first laser ablation pulse. Most recently, Mao et al 314 discussed the capability of LAMIS for the quantification of 86 Sr, 87 Sr, and 88 Sr isotopes and its possible application in radiogenic age determination. LAMIS can determine not only chemical composition but also isotopic ratios of elements in the sample, increasing the potential of LIBS in nuclear and forensic applications.…”

Section: ■ Ranging Approachesmentioning

confidence: 99%

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Laser-Induced Breakdown Spectroscopy

et al. 2012

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Section: Libs Methodsmentioning

confidence: 99%

Section: ■ Ranging Approachesmentioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy

et al. 2012

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“…The experimetal details of our DP-LIBS emission spectroscopy can be found elsewhere. [24] High temperature (∼18000 K) plasma was produced on the W-electrode surface under the action of applied two collinear Nd:YAG laser pulses. The laser arrangement includes a 266 nm laser I (Continuum model NY81-30) of 7 ns pulse duration and 30 Hz repetition rate utilized for ablation process.…”

Section: Experimental Details 21 Splas and Dplas Principlementioning

confidence: 99%

“…The dynamic behaviors of ion beams released from gold, silver, silicon, graphene, and stainless steel plasmas at various laser pulse durations have been reported. [24][25][26][27][28] In this work, the W ion source and high current signal under applied DPLAS geometry are generated for the first time. Farid et al [16] focused only on a single-pulse Nd:YAG laser ablation with an energy of 300 mJ at 1064 nm, 160 mJ at 532 nm, and 85 mJ at 355 nm, separately.…”

Section: Introductionmentioning

confidence: 99%

Tungsten ion source under double-pulse laser ablation system

et al. 2017

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New tungsten ion source is produced by using single and double-pulse laser ablation system. Combined collinear Nd:YAG laser beams (266+1064 nm) are optimized to focus on the sample in air. Optimization of the experimental parameters is achieved to enhance the signal-to-noise ratio of the emission spectra. The velocity distribution of the emitted plasma cloud is carefully measured. The influences of the potential difference between the bias electrodes, laser wavelength and intensity on the current signal are also studied. The results show that the increase in the tungsten ion velocity under the double-pulse lasers causes the output current signal to increase by about three folds. The electron density and temperature are calculated by using the Stark-broadened line profile of tungsten line and Boltzmann plot method of the upper energy levels, respectively. The signal intensity dependence of the tungsten ion angular distribution is also analyzed. The results indicate that the double-pulse laser ablation configuration is more potent technique for producing more metal ion source deposition, thin film formation, and activated plasma-facing component material.

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“…DP-LIBS techniques are applied in a number of important fields (nuclear energy, mining, art materials, environmental chemical pollution, thin films, nanoparticles, etc.). The collinear DP-LIBS configuration is a superior spectroscopic analytical technique as compared to the SP-LIBS configuration to understand the generation and expansion dynamics of the plasma induced by interaction of laser radiation with targets [15][16][17][18][19][20][21]. The analytical performance of the DP-LIBS technique is strongly dependent on the selection of the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Chemical etching method assisted double-pulse LIBS for the analysis of silicon crystals

Khalil

2015

Appl. Phys. A

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Two Nd:YAG lasers working in pulsed modes are combined in the same direction (collinear arrangement) to focus on silicon (Si) crystals in reduced oxygen atmosphere (0.1 mbar) for double-pulse laser-induced breakdown spectroscopy (DP-LIBS) system. Silicon crystals of (100) and (111) orientations were investigated, and Si samples were measured either without prior treatment (''untreated'') or after fabrication of nano-pores (''treated''). Nano-pores are produced by metal coating and by chemical etching. DP-LIBS spectra were compared for different Si samples (untreated, treated, (100) and (111) orientations), for double-pulse (DP) (with 266 nm pulse followed by 1064 nm pulse) excitation and for different delay times (times between the excitation laser pulse and the detection ICCD gate); treatment by chemical etching has been studied as well. The intensity of the atomic line Si I at 288.16 nm was enhanced by a factor of about three by using the DP-LIBS signals as compared to the single-pulse (SP) signal which could increase the sensitivity of the LIBS technique. This study proved that an optimized value of the etching time of Si during etching by chemical processes and short delay times are required. Plasma parameters [the electron temperature (T e ) and the electron number density (N e )] were calculated from measured SP-and DP-LIBS spectra. The most important result of this study is the much higher DP-LIBS intensity observed on Si (100) as compared to Si (111) for measurements under the same experimental conditions. This study could provide important reference data for the design and optimization of DP-LIBS systems involved in plasma-facing components diagnostics.

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A spectroscopic analysis study of graphite using laser technique

Cited by 21 publications

References 19 publications

Laser-Induced Breakdown Spectroscopy

Laser-Induced Breakdown Spectroscopy

Tungsten ion source under double-pulse laser ablation system

Chemical etching method assisted double-pulse LIBS for the analysis of silicon crystals

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