Download or read book Laser Ablation and Resonance Ionization Spectrometry for Trace Analysis of Solids written by Santos Mayo and published by . This book was released on 1982 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser Ablation and Resonance Ionization Spectroscopy LARIS for Trace Analysis of Solids written by S. Mayo and published by . This book was released on 1980 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new analytical technique has been developed for the detection of trace sodium impurity in single crystal silicon using laser ablation and resonance ionization spectroscopy. Sodium is detected in the ablated vapor by using two tunable laser probes to induce resonantly enhanced multiphoton ionization via the intermediate 3P and 4D levels. At present, the technique provides only relative quantitative results. For absolute quantitative results, characterization of complex laser-solid interaction phenomena in a buffer gas is required. The minimum detectable sodium density in the solid is estimated to be about 10 to the 11th power atoms/cu cm. Generalization of this technique to other impurities is limited only by laser availability. (Author).
Download or read book Optical Physics Study of Laser Interactions with Solids for Ultra Trace Materials Analysis Using RIS Phase 1 written by Norbert Thonnard and published by . This book was released on 1987 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of a new element analysis technique having sensitivity in the subpart per billion range was investigated. the method combines pulsed laser volatilization of a representative fraction of the sample with selective and efficient ionization of the element of interest by utilizing lasers tuned to specific transitions of the selected element. Tests on silicon and steel substrates determined cratering characteristics at incident power densities ranging from 10 to the 7th power to 2 x 10 to the 11th power W/sq cm. The quantity of material volatilized was proportional to the number of laser shots. A simple time-of-flight mass spectrometer was assembled, which together with the volatilization laser and resonance ionization laser was used to demonstrate the technique by analyzing 0.48 to 58 ppm Ga in Si samples. Sensitivity of 15 ppb was demonstrated, while the resonance ionization element selectivity was 10 to the 8th power. Guidelines were established for development of a prototype system with a 5 um analysis spot, a resonance ionization laser system for 80 elements, and a time-of-flight mass spectrometer with ablated ion rejection, thereby achieving sensitivity at the part in 10 to the 12th power. Keywords: Element analysis; Laser ablation; Resonance ionization; Semiconductor impurities; Materials characteristics; Sensitivity; Selectivity; Interference reduction; Quantitation; Trace studies.
Download or read book Trace Analysis Using Laser Ablation Initiated Resonant Ionisation Mass Spectrometry written by Paul Thomas McCombes and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Laser Ablation and Ionization of Solids for Chemical Analysis by Mass Spectrometry written by J. K. Holt and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A laser ablation/ionization mass spectrometer system is described for the direct chemical analysis of solids. An Nd:YAG laser is used for ablation and ionization of the sample in a quadrupole ion trap operated in an ion-storage (IS) mode that is coupled with a reflectron time-of-flight mass spectrometer (TOF-MS). Single pulse experiments have demonstrated simultaneous detection of up to 14 elements present in glasses in the ppm range. However, detection of the components has produced non-stoichiometric results due to difference in ionization potentials and fractionation effects. Time-of-flight secondary ionization mass spectrometry (TOF-SIMS) was used to spatially map elemental species on the surface and provide further evidence of fractionation effects. Resolution (m/Dm) of 1500 and detection limits of approximately 10 pg have been achieved with a single laser pulse. The system configuration and related operating principles for accurately measuring low concentrations of isotopes are described.
Download or read book Direct Chemical Analysis of Solids by Laser Ablation in an Ion Storage Time of Flight Mass Spectrometer written by and published by . This book was released on 2003 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A laser ablation/ionization mass spectrometer system is described for the direct analysis of solids, particles, and fibers. The system uses a quadrupole ion trap operated in an ion-storage (IS) mode, coupled with a reflectron time-of-flight mass spectrometer (TOF-MS). The sample is inserted radially into the ring electrode and an imaging system allows direct viewing and selected analysis of the sample. Measurements identified trace contaminants of Ag, Sn, and Sb in a Pb target with single laser-shot experiments. Resolution (m/[mu]m) of 1500 and detection limits of approximately 10 pg have been achieved with a single laser pulse. The system configuration and related operating principles for accurately measuring low concentrations of isotopes are described.
Download or read book Analysis of Solids by Laser Ablation Inductively Coupled Plasma Mass Spectrometry written by David Brian Aeschliman and published by . This book was released on 2003 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation manuscript concentrates on methods to improve the utility of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) as a rapid and accurate technique for quantitative analysis, forensic matching, and source attribution of solid samples. A solution calibration method for LA-ICP-MS is described that does not require matrix-matched solid standards or prior knowledge of sample composition. Desolvated particles from a microconcentric nebulizer and particles ablated from a localized position on a solid sample are mixed and introduced simultaneously to the ICP-MS. The transport of sample particulates from the ablation cell is measured online with piezoelectric microbalance to provide signal normalization. The relative accuracy of the quantitative analysis of NIST 612 glass and NIST 1264a steel is 3% and 12%, respectively, except for the elements Pb and Bi in steel. LA-ICP-MS is also used with principal components analysis (PCA) to simplify routine comparisons of forensic materials without time-consuming and destructive sample dissolution. The relative concentrations of trace elements in a solid sample are examined to provide a "fingerprint" composition that can be used for definitive identification and source matching of the material. Residue samples are matched to bulk materials using PCA. Variation of laser focus and PCA are also used to diagnose the presence and severity of elemental fractionation, which remains the most significant limitation for accurate quantitative analyses by LA-ICP-MS. High-speed photographs and video of an ICP are used to examine the validity of solution calibration for LA-ICP-MS and to study the trajectories, lifetimes, and emission behavior of particles traversing the plasma under a variety of conditions. No red emission clouds from YO are visible in the ICP when a 20-[mu]L min−1 nebulizer is used to spray a 2000 ppm aqueous yttrium solution, suggesting that the wet droplets from this nebulizer desolvate almost completely before entering the ICP. These desolvated particles appear to atomize and ionize like the small dry particulates from laser ablation. However, some large ablated particulates are observed to fly through the plasma intact, possibly contributing to elemental fractionation. Nevertheless, accurate calibration results using solution standards can be obtained for elements not affected by fractionation.
Download or read book Lew Md written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Application of Resonance Ionisation Mass Spectrometry to Trace Analysis in Solids written by Ian Stewart Borthwick and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1983 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Research of the National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1988 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser Ablation Ionization Characterization of Solids Final Progress Report of the Strategic Environmental Research and Development Program written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Department of Energy has undertaken the enormous task of remediating defense wastes and environmental insults which have occurred over 50 years of nuclear weapons production. It is abundantly clear that significant technology advances are needed to characterize, process, and store highly radioactive waste and to remediate contaminated zones. In addition to the processing and waste form issues, analytical technologies needed for the characterization of solids, and for monitoring storage tanks and contaminated sites do not exist or are currently expensive labor-intensive tasks. This report describes progress in developing sensitive, rapid, and widely applicable laser-based mass spectrometry techniques for analysis of mixed chemical wastes and contaminated soils. The remediation of defense waste and the long-term disposal of high-level mixed wastes requires chemical analysis of the waste streams. Efficient analytic methods are needed to characterize the chemical classes and concentrations of a wide variety of waste materials. Tank and crib waste sites contain broad distributions of radioisotopes, chelating agents, chromates, and ferrocyanides.
Download or read book Inorganic Speciation and Trace Analysis with Laser Time of flight Mass Spectrometry written by Todd McKitrick Allen and published by . This book was released on 1998 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resonance Ionization Spectroscopy 1992 Proceedings of the Sixth INT Symposium on Resonance Ionization Spectroscopy and its Applications Santa Fe New Mexico 24 29 May 1992 written by Charles M. Miller and published by CRC Press. This book was released on 1992-11-01 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resonance Ionization Spectroscopy 1992 brings together developments in resonance ionization spectroscopy (RIS), an ultrasensitive analytical technique for elemental or isotopic analysis. The development of RIS in this book is of great interest to researchers in laboratories working in physics, chemistry, materials science, and earth and environmental sciences.
Download or read book Lasers Induced Plasmas and Applications written by Leon J. Radziemski and published by CRC Press. This book was released on 2020-09-11 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the physics of plasma initiation and reviews the features of dissipating, propagating plasmas. It deals with advances in diagnostics for high-energy, laser-fusion plasmas. The book reviews the basic physical processes, plasma characteristics of the "continuous optical discharge".
Download or read book Resonant Laser Ablation written by Peter Stchur and published by . This book was released on 2003 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
