The Experts below are selected from a list of 18063 Experts worldwide ranked by ideXlab platform
Robert J. Gordon - One of the best experts on this subject based on the ideXlab platform.
-
Nanosecond polarization-resolved Laser-Induced Breakdown Spectroscopy
Optics letters, 2010Co-Authors: Yaoming Liu, John S. Penczak, Robert J. GordonAbstract:It is shown that the continuum emission produced in the ablation of an Al target with nanosecond laser pulses is much more strongly polarized than the discrete line emission. This effect may be utilized to improve the resolution of the Laser-Induced Breakdown Spectroscopy spectrum by using a polarizer to filter out the continuum background. The effects of laser fluence and focal position are also reported. It is further shown that the lifetime of the emission closely tracks the intensity spectrum.
-
Polarization-resolved Laser-Induced Breakdown Spectroscopy
Optics letters, 2009Co-Authors: Youbo Zhao, Sima Singha, Yaoming Liu, Robert J. GordonAbstract:It is shown that plasma polarization measurements can be used to enhance the sensitivity of Laser-Induced Breakdown Spectroscopy (LIBS). The polarization of the plasma emission is used to suppress the continuum with only slight attenuation of the discrete atomic and ionic spectra. The method is demonstrated for LIBS detection of copper and carbon samples ablated by pairs of femtosecond laser pulses.
Yaoming Liu - One of the best experts on this subject based on the ideXlab platform.
-
Nanosecond polarization-resolved Laser-Induced Breakdown Spectroscopy
Optics letters, 2010Co-Authors: Yaoming Liu, John S. Penczak, Robert J. GordonAbstract:It is shown that the continuum emission produced in the ablation of an Al target with nanosecond laser pulses is much more strongly polarized than the discrete line emission. This effect may be utilized to improve the resolution of the Laser-Induced Breakdown Spectroscopy spectrum by using a polarizer to filter out the continuum background. The effects of laser fluence and focal position are also reported. It is further shown that the lifetime of the emission closely tracks the intensity spectrum.
-
Polarization-resolved Laser-Induced Breakdown Spectroscopy
Optics letters, 2009Co-Authors: Youbo Zhao, Sima Singha, Yaoming Liu, Robert J. GordonAbstract:It is shown that plasma polarization measurements can be used to enhance the sensitivity of Laser-Induced Breakdown Spectroscopy (LIBS). The polarization of the plasma emission is used to suppress the continuum with only slight attenuation of the discrete atomic and ionic spectra. The method is demonstrated for LIBS detection of copper and carbon samples ablated by pairs of femtosecond laser pulses.
Vincenzo Palleschi - One of the best experts on this subject based on the ideXlab platform.
-
Laser-Induced Breakdown Spectroscopy: principles of the technique and future trends
ChemTexts, 2020Co-Authors: Vincenzo PalleschiAbstract:This text is intended as an introductory reading covering the principles of Laser-Induced Breakdown Spectroscopy (LIBS), its main applications, and the most promising future trends of the technique. It could be considered as the basis of three or four lectures (6–8 h) in a university course of analytical chemistry/applied Spectroscopy.
-
Industrial applications of Laser-Induced Breakdown Spectroscopy: a review
Analytical Methods, 2020Co-Authors: Stefano Legnaioli, M. A. Harith, Beatrice Campanella, Francesco Poggialini, Stefano Pagnotta, Z. Abdel-salam, Vincenzo PalleschiAbstract:In this review we present a short, although comprehensive, review on the industrial applications of Laser-Induced Breakdown Spectroscopy (LIBS). Attention has been devoted to the applications where LIBS can potentially make a difference with respect to other traditional techniques, namely steel and coal industries, and new emerging applications, where the intrinsic features of LIBS are particularly interesting, such as sorting of waste for selective recycling.
-
Calibration free Laser-Induced Breakdown Spectroscopy of oxide materials
Spectrochimica Acta Part B: Atomic Spectroscopy, 2010Co-Authors: B. Praher, Vincenzo Palleschi, R. Viskup, Johannes Heitz, Johannes D. PedarnigAbstract:Abstract The quantitative determination of oxide concentration by Laser-Induced Breakdown Spectroscopy is relevant in various fields of applications (e.g.: analysis of ores, concrete, slag). Calibration free Laser-Induced Breakdown Spectroscopy and the multivariate calibration are among the methods employed for quantitative concentration analysis of complex materials. We measured the intensity of neutral and ionized atomic emission lines of oxide materials by Laser-Induced Breakdown Spectroscopy and we modified the calibration free Laser-Induced Breakdown Spectroscopy method to increase the accuracy. The concentration of oxides was obtained by using stoichiometric relations. Sample materials were prepared from oxide powder (Fe 2 O 3 , MgO, CaO) by mixing and pressing. The concentration was 9.8–33.3 wt.% Fe 2 O 3 , 7.6–33.3 wt.% MgO and 33.3–81.2 wt.% CaO for different samples. Nd:YAG laser (wavelength 1064 nm, pulse duration ≈ 6 ns) ablation was performed in air. The Laser-Induced plasma emission was measured by an Echelle spectrometer equipped with a sensitivity calibrated ICCD camera. The numerical calibration free Laser-Induced Breakdown Spectroscopy algorithm included the fast deconvolution of instrumental function, and the correction of self-absorption effects. The oxide concentration C CF calculated from calibration free Laser-Induced Breakdown Spectroscopy results and the nominal concentration C N were very close for all samples investigated. The relative error in concentration, | C CF – C N |/ C N , was 2 O 3 , MgO, and CaO, respectively. The results indicate that this method can be employed for the analysis of major elements in multi-component technical materials.
-
Archaeometric Analysis of Ancient Copper Artefacts by Laser-Induced Breakdown Spectroscopy Technique
Mikrochimica Acta, 2005Co-Authors: M. Corsi, Vincenzo Palleschi, Gabriele Cristoforetti, Marcella Giuffrida, Montserrat Hidalgo, Stefano Legnaioli, Leonardo Masotti, Azenio Salvetti, Elisabetta Tognoni, Chiara VallebonaAbstract:Twelve archaeological copper objects from the burial site of “Fontino” cave, near Grosseto, (around 2500–2000 B.C.) were analysed using Laser-Induced Breakdown Spectroscopy. Qualitative results and a preliminary study of the samples’ composition are reported and used to make a quantitative estimate; based on these results, the samples were classified using principal components statistical analysis. The perspectives of using Laser-Induced Breakdown Spectroscopy for archaeometric analysis are also discussed.
-
Effect of laser pulse energies in laser induced Breakdown Spectroscopy in double-pulse configuration
Spectrochimica Acta Part B: Atomic Spectroscopy, 2005Co-Authors: P.a. Benedetti, Vincenzo Palleschi, Gabriele Cristoforetti, Stefano Legnaioli, Azenio Salvetti, L. Pardini, Elisabetta TognoniAbstract:In this paper, the effect of laser pulse energy on double-pulse laser induced Breakdown Spectroscopy signal is studied. In particular, the energy of the first pulse has been changed, while the second pulse energy is held fixed. A systematic study of the laser induced Breakdown Spectroscopy signal dependence on the interpulse delay is performed, and the results are compared with the ones obtained with a single laser pulse of energy corresponding to the sum of the two pulses. At the same time, the crater formed at the target surface is studied by video-confocal microscopy, and the variation in crater dimensions is correlated to the enhancement of the laser induced Breakdown Spectroscopy signal. The results obtained are consistent with the interpretation of the double-pulse laser induced Breakdown Spectroscopy signal enhancement in terms of the changes in ambient gas pressure produced by the shock wave induced by the first laser pulse.
Jagdish P. Singh - One of the best experts on this subject based on the ideXlab platform.
-
Combustion Applications of Laser-Induced Breakdown Spectroscopy
Springer Series in Optical Sciences, 2014Co-Authors: Fang Y. Yueh, Markandey M. Tripathi, Jagdish P. SinghAbstract:The Laser induced Breakdown Spectroscopy (LIBS) has been applied to combustion product and flame diagnostics. In this chapter, combustion applications of LIBS in past 30 years were reviewed. The various issues including experimental parameters and data processing methods that are important to combustion applications were discussed. Possible other applications that are important to combustion have also been addressed.
-
North American Symposium on Laser-Induced Breakdown Spectroscopy: introduction to the feature issue
Applied Optics, 2010Co-Authors: Jagdish P. Singh, José R. Almirall, Steven J. RehseAbstract:This feature issue highlights the topics presented at the 2009 North American Symposium on Laser-Induced Breakdown Spectroscopy, in New Orleans, Louisiana, held 13–15 July 2009.
-
Laser induced Breakdown Spectroscopy (LIBS): Application to material processing
2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics, 2009Co-Authors: Jagdish P. Singh, Fang Y. YuehAbstract:A fiber optic (FO) Laser-Induced Breakdown Spectroscopy (LIBS) sensor which can measure on-line, in situ elemental composition of molten alloy and can be used as a process monitor and control tool for glass, aluminum and steel melter is described.
-
Analysis of plutonium oxide surrogate residue using Laser-Induced Breakdown Spectroscopy
Spectrochimica Acta Part B: Atomic Spectroscopy, 2008Co-Authors: Hongbo Zheng, Fang-yu Yueh, Jagdish P. Singh, Tracy S. Miller, Kristine E. Zeigler, James C. MarraAbstract:Abstract Laser-Induced Breakdown Spectroscopy was used to determine the elemental composition of a CeO2 composite powder for process control verification during lanthanide borosilicate glass fabrication. Cerium oxide is used as a surrogate for plutonium oxide, which along with other canister contents will be combined with frit to make glass. Laser-Induced Breakdown Spectroscopy data for the composition of the CeO2 batch containing concentrations of Ce, Cr, Si, Fe, Ta, Ni, Zn, Al Mg, Gd, and W were quantitatively determined from Laser-Induced Breakdown Spectroscopy spectra of both pellet and powder samples. The results of both forms were compared and it was determined that the pellet data gave slightly better precision than the powder sample.
-
Laser induced Breakdown Spectroscopy ~Application to Tissue Analysis~
Laser Applilcations to Chemical Security and Environmental Analysis, 2006Co-Authors: Hongbo N. Zheng, Fang-yu Yueh, Shane C. Burgess, Jagdish P. SinghAbstract:Laser-Induced Breakdown Spectroscopy (LIBS) is applied to characterize animal tissue samples. Samples include brain, kidney, liver, lung, muscle and spleen tissues.
Andrzej W. Miziolek - One of the best experts on this subject based on the ideXlab platform.
-
Laser-Induced Breakdown Spectroscopy of Polymer Matrix Nanocomposites
2007 Conference on Lasers and Electro-Optics (CLEO), 2007Co-Authors: Caroline Mcennis, Brigid O'brien, Yamac Dikmelik, Dajie Zhang, James B Spicer, Frank C. De Lucia, Andrzej W. MiziolekAbstract:Laser-Induced Breakdown Spectroscopy was used to study polymer matrix nanocomposites containing metal nanoparticles. We have observed emission from the silver and palladium nanoparticles as well as CN and C2 molecules owing to the polymer matrix.
-
Double pulse laser ablation and plasma: Laser induced Breakdown Spectroscopy signal enhancement
Spectrochimica Acta Part B: Atomic Spectroscopy, 2006Co-Authors: Valeri I. Babushok, Frank C. Delucia, Jennifer L. Gottfried, Chase A. Munson, Andrzej W. MiziolekAbstract:A review of recent results of the studies of double laser pulse plasma and ablation for laser induced Breakdown Spectroscopy applications is presented. The double pulse laser induced Breakdown Spectroscopy configuration was suggested with the aim of overcoming the sensitivity shortcomings of the conventional single pulse laser induced Breakdown Spectroscopy technique. Several configurations have been suggested for the realization of the double pulse laser induced Breakdown Spectroscopy technique: collinear, orthogonal pre-spark, orthogonal pre-heating and dual pulse crossed beam modes. In addition, combinations of laser pulses with different wavelengths, different energies and durations were studied, thus providing flexibility in the choice of wavelength, pulse width, energy and pulse sequence. The double pulse laser induced Breakdown Spectroscopy approach provides a significant enhancement in the intensity of laser induced Breakdown Spectroscopy emission lines up to two orders of magnitude greater than a conventional single pulse laser induced Breakdown Spectroscopy. The double pulse technique leads to a better coupling of the laser beam with the plasma plume and target material, thus providing a more temporally effective energy delivery to the plasma and target. The experimental results demonstrate that the maximum effect is obtained at some optimum separation delay time between pulses. The optimum value of the interpulse delay depends on several factors, such as the target material, the energy level of excited states responsible for the emission, and the type of enhancement process considered. Depending on the specified parameter, the enhancement effects were observed on different time scales ranging from the picosecond time level (e.g., ion yield, ablation mass) up to the hundred microsecond level (e.g., increased emission intensity for laser induced Breakdown Spectroscopy of submerged metal target in water). Several suggestions have been proposed to explain the mechanism of double pulse enhancement.
-
Spectroscopic analysis of fire suppressants and refrigerants by Laser-Induced Breakdown Spectroscopy
Applied optics, 1999Co-Authors: Edwin D. Lancaster, Kevin L. Mcnesby, Robert G. Daniel, Andrzej W. MiziolekAbstract:Laser-Induced Breakdown Spectroscopy is evaluated as a means of detecting the fire suppressants CF(3)Br, C(3)F(7)H, and CF(4) and the refrigerant C(2)F(4)H(2). The feasibility of employing Laser-Induced Breakdown Spectroscopy for time- and space-resolved measurement of these agents during use, storage, and recharge is discussed. Data are presented that demonstrate the conditions necessary for optimal detection of these chemicals.
