Study of laser ablation of brass materials using inductively coupled plasma atomic emission spectrometric detection

Gagean, M.; Mermet, Jean‐Michel

doi:10.1016/s0584-8547(98)00082-2

Cited by 34 publications

(11 citation statements)

References 25 publications

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“…Several works have shown that brass samples suffer significantly from fractionation effects and numerous studies have already been carried out to understand the mechanisms behind the fractional ablation using a variety of laser and sample conditions. [44][45][46][47][48][49] The main factors which influence fractionation in brass are the laser wavelength, pulse duration and irradiance. Mao et al 45 indicated that at low irradiances (<0.3 GW cm À2 ) and long pulse durations (>30 ns), the mechanism involved is thermal vaporization, while at higher irradiances (>1 GW cm À2 ) and shorter pulse durations ($3 ns), the mechanism is governed by both thermal and non-thermal processes and the Zn/Cu ratio approaches stoichiometry but the ablated mass always remains enriched in Zn.…”

Section: Quantitative Analysis Of Brassmentioning

confidence: 99%

Semi-quantitative analysis of metal alloys, brass and soil samples by calibration-free laser-induced breakdown spectroscopy: recent results and considerations

Herrera

Tognoni

Omenetto

et al. 2009

J. Anal. At. Spectrom.

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The calibration-free methodology described in the literature dealing with the technique of laser induced breakdown spectroscopy has been applied here to several samples under different operating pressures with the aim of classifying the analytical technique as quantitative, semi-quantitative or qualitative (with quantitative estimates only), depending on the relative percentage errors calculated for the major, minor and trace elemental composition of the sample. The results were obtained with a Q-switched Nd:YAG laser (1064 nm), characterized by 5.3 ns duration pulses at a maximum repetition frequency of 10 Hz and with pulse energy up to 300 mJ. The spectra were taken with a grating monochromator coupled with an intensified CCD detector, calibrated from 220 to 700 nm. The samples investigated were aluminum alloy standard disks, standard reference materials of Zn alloy, Cu-Ni alloy, Ti alloy, Ni alloy powder, Cu-Zn alloy and soils. The data are compared with those published in the literature. The results show that the best accuracy (5% relative error) is usually obtained for the matrix element, while in most cases, for the remainder of the components in the sample (major, minor or trace composition), the results can only be considered semi-quantitative (<200% relative error).

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Section: Quantitative Analysis Of Brassmentioning

confidence: 99%

Semi-quantitative analysis of metal alloys, brass and soil samples by calibration-free laser-induced breakdown spectroscopy: recent results and considerations

Herrera

Tognoni

Omenetto

et al. 2009

J. Anal. At. Spectrom.

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“…Depending on the material, a working regime between 1-10 mJ, which translates into fluences between 1-100 J cm À2 or intensities between 10 8 -10 13 W cm À2 , has been found beneficial for most applications. 4,[19][20][21][22][23] The regime above 10 10 W cm À2 is only reached with ultra-short (o1 ps) laser pulses.…”

Section: Description Of the Modelmentioning

confidence: 99%

A model of non-congruent laser ablation as a source of fractionation effects in LA-ICP-MS

Hergenröder

2006

J. Anal. At. Spectrom.

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A model for laser ablation under conditions which are typical for LA-ICP-MS (He or Ar atmosphere, fluences below 100 J cm À2 ) is proposed that identifies the melted and subsequently re-solidified portion of the heated sample as a possible source for element-specific fractionation. Based on the full 3-dimensional description of the heat conduction problem, the heating, melting and evaporation of a sample is analytically modelled. Incorporation of radial heat losses provides a more realistic picture of the achievable surface temperature. Owing to the division of the ablation zone into a congruently vaporized part with stoichiometric mass removal and a zone of non-stoichiometric evaporation, the portion that laser ablation contributes to the total fractionation in LA-ICP-MS can be identified. The model describes the fluence dependence of fractionation, explains the size-dependent chemical composition of the particles, and the influence of the atmosphere on laser sampling. The theoretical predictions are compared with literature data and a fairly good agreement is found, especially for dilute alloys. Based on the model, optimal conditions for laser sampling in relation to a specific sample can be identified.

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“…Instrumentation also plays a major role in LIBS signals, as evidenced by the study of Unnikrishnan et al [16]. Brass has also been studied extensively, either using inductively coupled or laser-induced plasmas [17][18][19][20][21][22], with the main interest being that as a binary alloy characterized by a large difference in thermal properties of copper and zinc, brass presents a good example to study preferential ablation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Laser-Induced Brass and Copper Plasma for Spectroscopic Applications

Gojani

2012

ISRN Spectroscopy

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This paper presents time-resolved and space-integrated laser-induced breakdown spectroscopic (LIBS) analysis of copper and brass plasma. It was observed that copper emission is very strong during the first hundred nanoseconds of the plasma, but then some lines (e.g., at 327.4 nm) decrease in intensity, while others (e.g., 521.8 nm) slightly increase. Zinc lines, on the other hand, did not decrease significantly in intensity even two microseconds after ablation, but they became narrower due to the decrease of the density of free electrons. Copper line intensities showed the same characteristics regardless whether the plasma was created in a metallic copper or brass sample. Assuming local thermodynamic equilibrium, plasma temperature, and electron density is obtained from Boltzmann plot and Lorentzian profile fitting, respectively. The effect of subsequent irradiation on the same spot was investigated, and the number of necessary shots for surface cleaning was determined.

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Study of laser ablation of brass materials using inductively coupled plasma atomic emission spectrometric detection

Cited by 34 publications

References 25 publications

Semi-quantitative analysis of metal alloys, brass and soil samples by calibration-free laser-induced breakdown spectroscopy: recent results and considerations

Semi-quantitative analysis of metal alloys, brass and soil samples by calibration-free laser-induced breakdown spectroscopy: recent results and considerations

A model of non-congruent laser ablation as a source of fractionation effects in LA-ICP-MS

Experimental Study of Laser-Induced Brass and Copper Plasma for Spectroscopic Applications

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