Comparative study of two new commercial echelle spectrometers equipped with intensified CCD for analysis of laser-induced breakdown spectroscopy

Sabsabi, Mohamad; Detalle, Vincent; Harith, M. A.; Tawfik, Walid; Imam, Hisham

doi:10.1364/ao.42.006094

Cited by 56 publications

(31 citation statements)

References 19 publications

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“…By changing the echelle grating (specific groove density and blaze angle) and the cross-dispersing prism, their echelle spectrograph can generate a bi-dimensional dispersion of any rectangular shape to match bi-dimensional detecting systems of different areas, placed outside the spectrograph housing. Sabsabi et al 147 described a comparison between two commercial echelle spectrometers (ESA 3000 from LLA Instruments and Mechelle 7500 from Multichannel Instruments) in terms of detectivity and precision for determination of Be, Mg, Si, Mn, Fe and Cu in Al alloy samples, concluding that both presented similar performances.…”

Section: Wavelength Selectorsmentioning

confidence: 99%

“…These photons are guided by a fiber optic taper or by a lens to the sensitive surface of the detecting device. 147,157 The acceleration voltage applied on the MCP is variable, defining the gain of the intensifier, and its ability for fast switching allows gating of the optical detection on a nanosecond time scale (down to few nanoseconds). An illustration of a bi-dimensional ICCD is shown in Figure 7b.…”

Section: Detecting Systemsmentioning

confidence: 99%

See 1 more Smart Citation

Laser Induced Breakdown Spectroscopy

Pasquini¹,

Cortez²,

Silva³

et al. 2007

J. Braz. Chem. Soc.

342

195

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Esta revisão descreve os aspectos fundamentais, a instrumentação, as aplicações e tendências futuras de uma técnica analítica que se encontra em seu estágio de consolidação e que está em vias de estabelecer o seu nicho entre as técnicas espectrofotométricas modernas. A técnica é denominada Espectroscopia de Emissão em Plasma Induzido por Laser (em inglês, Laser Induced Breakdown Spectroscopy, LIBS) e sua principal característica está no uso de pulsos de laser como fonte de energia para vaporizar a amostra e excitar a emissão de radiação eletromagnética, a partir de seus elementos e/ou fragmentos moleculares. A radiação emitida é analisada por meio de instrumentos ópticos de alta resolução e as suas intensidades são medidas, usualmente com detectores rápidos de estado sólido. Em conjunto, esses dispositivos permitem a geração e a medida de um espectro de emissão de faixa ampla do fenômeno induzido pelo pulso de laser. O espectro registrado contém informação qualitativa e quantitativa que pode ser correlacionada com a identidade da amostra ou empregada na determinação da quantidade de seus constituintes. Essa revisão é dividida em quatro partes. A primeira aborda aspectos históricos da técnica e os conceitos teóricos relevantes associados com LIBS; então, os aspectos práticos de diversas abordagens experimentais e instrumentais empregadas na implementação da técnica são revistos de forma crítica; as aplicações encontradas na literatura, incluindo aquelas que empregam quimiometria, são classificadas e exemplificadas por meio de trabalhos relevantes recentemente publicados. Finalmente, uma tentativa de estabelecer uma avaliação global e as perspectivas futuras para a técnica é apresentada.This review describes the fundamentals, instrumentation, applications and future trends of an analytical technique that is in its early stages of consolidation and is establishing its definitive niches among modern spectrometric techniques. The technique has been named Laser Induced Breakdown Spectroscopy (LIBS) and its main characteristic stands in the use of short laser pulses as the energy source to vaporize samples and excite the emission of electromagnetic radiation from its elements and/or molecular fragments. The emitted radiation is analyzed by high resolution optics and the intensities are recorded, usually by fast triggered solid state detectors. Together, these devices allow producing and registering a wide ranging emission spectrum of the short-lived phenomenon induced by the laser pulse. The spectrum contains qualitative and quantitative information which can be correlated with sample identity or can be used to determine the amount of its constituents. This review is divided in four parts. First, the relevant historical and theoretical concepts associated with LIBS are presented; then the main practical aspects of the several experimental and instrumental approaches employed for implementation of the technique are critically described; the applications related in the literature, including those making use of chemometri...

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Section: Wavelength Selectorsmentioning

confidence: 99%

Section: Detecting Systemsmentioning

confidence: 99%

Laser Induced Breakdown Spectroscopy

Pasquini¹,

Cortez²,

Silva³

et al. 2007

J. Braz. Chem. Soc.

342

195

View full text Add to dashboard Cite

show abstract

“…The spectral width of Stark broadening for an elemental-emission line depends on the electronic density [2]. For a non-H-like spectral line, the N e (in cm ) is determined from the (Δλ 1/2 ) of the line from the following formula [9][10][11][12][13] ;…”

Section: Electron Densitymentioning

confidence: 99%

Qualitative Analysis and Plasma Characteristics of Soil from a Desert Area using LIBS Technique

Farooq¹,

Tawfik²,

Al-Mutairi³

et al. 2013

Journal of the Optical Society of Korea

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In this work, laser induced breakdown spectroscopy (LIBS) is used to investigate soil samples collected from different desert areas of Riyadh city in Saudi Arabia. Both qualitative analysis and plasma parameters are studied via the observed LIBS spectra. These experiments have been done using a Spectrolaser-7000 system with 50 mJ fundamental wavelength of Nd:YAG laser and detection delay time of 1 microsecond. Many spectral lines are highly resolved for many elements like Al, Fe, Mg, Si, Mn, Na, Ca and K. The electron temperatures Te and electron densities Ne, for the constituent of generated LIBS plasma, are determined for all the collected samples. It is found that both Te and Ne vary from one desert area to other. This variation is due to the change of the elemental concentration in different desert areas that affects the sample's matrices. Time dependent measurements have also been performed on the soil samples. While the signal-to-base ratio (SBR) reached its optimal value at 1 microsecond, the plasma parameters Ne and Te reach values of 4×10 17 cm -3 and 9235 K, respectively, at 2.5 microsecond. The later indicate that the plasma cooling processes are slow in comparison to the previously observed results for metallic samples.The observed results show also that in the future it is possible to enhance the exploitation of LIBS in the remote on-line environmental monitoring application, by following up only the values of Ne and Te for one element of the soil desert sample using an optical fiber probe.

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“…Spectrochemical analysis using LIBS has proven to be extremely versatile, providing multi-element analysis in real time without sample preparation. LIBS can be regarded as a universal sampling, atomization, excitation and ionization source, since laserinduced plasmas can be produced in gases [1] or liquids [2], as well as from conducting or non-conducting solid samples [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The matrix effect can result in the sample being ablated differently from the target sample. Previously published works studied the matrix effect under different experimental conditions to specify causes and find out the methods of correction [3,4,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%