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 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 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 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 Trace Analysis By Mass Spectrometry written by Arthur J. Ahearn and published by Elsevier. This book was released on 2012-12-02 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trace Analysis by Mass Spectrometry deals with trace analysis of solids and liquids by mass spectrometric techniques. Topics include the physics and techniques of electrical discharge ion sources, transmission of ions through double focusing mass spectrometers, and detection and measurement of ions by ion-sensitive plates. The ion sources used are principally electrical discharge type sources. This book is comprised of 14 chapters. The first several chapters focus on the basic physics of electrical discharge ion sources, double focusing mass spectrometry, and the measurement of arrays of mass resolved ion beams by electrical detection methods and with ion sensitive emulsions. The discussion then shifts to the problem of obtaining the chemical composition of the recorded mass resolved ion sample and relating this composition to that of the original sample. The chapters that follow describe specific techniques for analyzing special samples such as insulators, powders, microsamples, biological materials, reactive and low melting point substances, radioactive materials, and gases in solids. The remaining chapters include the use of laser ion sources in the analysis of solids and the analysis of surfaces particularly with sputter ion sources. This book will be of interest to students and practitioners of physics and chemistry.
Download or read book Resonant Laser Ablation of Metals for Trace Metal Analysis by Plasma Optical and Inductively Coupled Plasma Mass Spectrometries written by Danielle M. Cleveland and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sample Handling and Trace Analysis of Pollutants written by Damia Barcelo and published by Elsevier. This book was released on 2000-03-08 with total page 1151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an updated, completely revised version of a previous volume in this series entitled: ENVIRONMENTAL ANALYSIS -- Techniques, applications and quality assurance. The book treats different aspects of environmental analysis such as sample handling and analytical techniques, the applications to trace analysis of pollutants (mainly organic compounds), and quality assurance aspects, including the use of certified reference materials for the quality control of the whole analytical process. New analytical techniques are presented that have been developed significantly over the last 6 years, like solid phase microextraction, microwave-assisted extraction, liquid chromatography-mass spectrometric methods, immunoassays, and biosensors. The book is divided into four sections. The first describes field sampling techniques and sample preparation in environmental matrices: water, soil, sediment and biota. The second section covers the application areas which are either based on techniques, like the use of gas chromatography-atomic emission detection, immunoassays, or coupled-column liquid chromatography, or on specific application areas, like chlorinated compounds, pesticides, phenols, mycotoxins, phytotoxins, radionuclides, industrial effluents and wastes, including mine waste. Validation and quality assurance are described in the third section, together with the interpretation of environmental data using advanced chemometric techniques. The final section reports the use of somewhat advanced analytical methods, usually more expensive, less routinely used or less developed, for the determination of pollutants.
Download or read book Analysis of Surfaces Films and Multilayers by Resonant Laser Ablation written by and published by . This book was released on 1995 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this manuscript we review briefly the history of Resonant Laser Ablation (RLA), and discuss some current ideas regarding sample preparation, laser parameters, and mechanisms. We also discuss current applications including spectral analysis of trace components, depth profiling of thin films and multilayer structures, and the use of RLA with the Ion Trap Mass Spectrometer (ITMS).
Download or read book Resonant Laser Ablation written by and published by . This book was released on 1994 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ever since the first report of laser action, it has been recognized that laser ablation (evaporation/volatilization) may provide a useful sampling mechanism for chemical analysis. In particular, laser ablation is rapidly gaining popularity as a method of sample introduction for mass spectrometry. While most laser ablation/mass spectrometry has been performed with fixed frequency lasers operating at relatively high intensities/fluences (≥108 W/cm2, ≥1 J/cm2), there has been some recent interest in the use of tunable lasers to enhance the ionization yield of selected components in an analytical sample. This process has been termed resonant laser ablation (RLA), and typically relies on irradiation of a sample in a mass spectrometer with modest intensity laser pulses tuned to a one- or two-photon resonant transition in the analyte of interest. Potential advantages of RLA include: (1) simplification of the mass spectrum, by enhancement of signal from the analyte of interest; (2) improvement of the absolute detection limits by improving the ionization efficiency, and (3) improvement in relative sensitivity. The sensitivity enhancement results from reduction of spurious signal, and accompanying noise, in the detection channel. This spurious signal may be due to bleed through from adjacent mass channels, or from isobaric interferences. RLA tends to produce higher mass resolution because of minimal spatial spread in the ion source and small space charge effects. In this manuscript we present a survey of RLA attributes and applications.
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 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 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:
Download or read book Inorganic trace Analysis by laser ionization mass spectrometry written by Sabine Becker and published by . This book was released on 1991 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser Ablation Inductively Coupled Plasma Mass Spectrometry LA ICP MS as a Biomonitoring Tool written by Brianne Duncan and published by . This book was released on 2019 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) this research analyzed human cadaver hair for gadolinium and mice hair samples for cadmium. This project combined fundamental bench science (analytical chemistry and animal studies), and insight into exposures to an emerging contaminant. This study demonstrated the feasibility of LA-ICP-MS to measure time resolved exposure profiles in hair samples, potentially opening up a transformative new exposure analysis method for investigators conducting both bench toxicology and human epidemiology studies. Consecutive autopsy cases that presented at the University of Washington's medical department, who had received a gadolinium-based contrasting agent (GBCA) to enhance magnetic resonance imaging procedures constituted the human population component of this research. Multiple hairs from numerous subjects were analyzed using LA-ICP-MS along with calibration gels (bovine-skin based) and a standard reference material glass disc with trace metals. Overall analytical method accuracy and precision was acceptable. There was moderate correlation between gadolinium dose and area under the curve as well as gadolinium peak position and GBCA injection day. Hair concentrations were also compared to the other tissue (brain, bone, and skin) concentrations using linear regression. This analysis showed good correlation between hair gadolinium concentrations and brain and skin gadolinium concentrations. These results suggest that hair may serve as a safe and effective biomonitoring tissue for patients who receive GBCA injections. A mouse animal model was used to evaluate LA-ICP-MS as a biomonitoring tool in assessing cadmium exposure. Hair samples from mice that were part of a mechanistic toxicology study at the University of Washington were opportunistically obtained for inclusion in this analytical methods-focused element of the research. The mice were dosed with cadmium-spiked water at three levels (0, 0.6, and 3 mg/L) for 14 weeks before they were sacrificed. Hairs from seven mice were analyzed using LA-ICP-MS. This research showed that there were increasing concentrations of cadmium in hair shafts with increasing doses of cadmium in drinking water among mice.
Download or read book Laser Ionization Mass Spectrometry as a Powerful Tool for Trace Gas Analysis written by Ruben Magdaleno Garnica and published by . This book was released on 2002 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser Ablation Electrospray Ionization for Ambient Analysis and Molecular Imaging with Mass Spectrometry written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser ablation electrospray ionization for ambient analysis and molecular imaging with mass spectrometry.
