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Agency br dating link suggest

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This review describes a modern analytical technique based on emission spectroscopy that employs a short pulse of high energy radiation generated by a laser focused on a sample, in order to attain representative vaporization and excitation.

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. 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 chemometrics, are classified and exemplified with relevant and recently published work.5 ns or shorter) pulsed laser, a focusing lens, collecting optics for the emitted radiation, a wavelength analyzer and a detector, all computer controlled.The simplest way to produce the analytical information (spectral lines of emission generated by the analytes) using LIBS is to fire a single laser pulse on a solid sample.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. 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.

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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.