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Pre Processing Influences On Multivariate Data Analysis Of Time Of Flight Secondary Ion Mass Spectroscopy Data And Images
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Book Synopsis Pre-processing Influences on Multivariate Data Analysis of Time-of-flight Secondary Ion Mass Spectroscopy Data and Images by : Thérèse Gerri-Ann Lee
Download or read book Pre-processing Influences on Multivariate Data Analysis of Time-of-flight Secondary Ion Mass Spectroscopy Data and Images written by Thérèse Gerri-Ann Lee and published by . This book was released on 2014 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multivariate Data Analysis for Root Cause Analyses and Time-of-Flight Secondary Ion Mass Spectrometry by : Danica Heller-Krippendorf
Download or read book Multivariate Data Analysis for Root Cause Analyses and Time-of-Flight Secondary Ion Mass Spectrometry written by Danica Heller-Krippendorf and published by Springer Nature. This book was released on 2019-10-31 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: Danica Heller-Krippendorf develops concepts and approaches optimizing the applicability of MVA on data sets from an industrial context. They enable more time-efficient MVA of the respective ToF‐SIMS data. Priority is given to two main aspects by the author: First, the focus is on strategies for a more time-efficient collection of the input data. This includes the optimal selection of the number of replicate measurements, the selection of input data and guidelines for the selection appropriate data preprocessing methods. Second, strategies for more efficient analysis of MVA results are presented. About the Author: Danica Heller-Krippendorf did her research and dissertation at the University of Siegen, Germany, in collaboration with a German analytical service company. Now she is engineer in analytics at a DAX company.
Book Synopsis Time-of-flight Secondary Ion Mass Spectrometry by : Joanna Lee
Download or read book Time-of-flight Secondary Ion Mass Spectrometry written by Joanna Lee and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is a powerful technique for the analysis of organic surfaces and interfaces for many innovative technologies. However, despite recent developments, there are still many issues and challenges hindering the robust, validated use of ToF-SIMS for quantitative measurement. These include: the lack of metrology and fundamental understanding for the use of novel cluster primary ion beams such as C60n+ and Ar2000 +; the need for validated and robust measurement protocols for difficult samples, such as those with significant micron scale surface topography; the lack of guidance on novel data analysis methods including multivariate analysis which have the potential to simplify many time-consuming and intensive analyses in industry; and the need to establish best practice to improve the accuracy of measurements. This thesis describes research undertaken to address the above challenges. Sample topography and field effects were evaluated experimentally using model conducting and insulating fibres and compared with computer simulations to provide recommendation to diagnose and reduce the effects. Two popular multivariate methods, principal component analysis (PCA) and multivariate curve resolution (MCR), were explored using mixed organic systems consisting of a simple polymer blend and complex hair fibres treated with a multi-component formulation to evaluate different multivariate and data preprocessing methods for the optimal identification, localisation and quantification of the chemical components. Finally, cluster ion beams C60 n+ and ArSOO-2S00 + were evaluated on an inorganic surface and an organic delta layer reference material respectively to elucidate the fundamental metrology of cluster ion sputtering and pave the way for their use in organic depth profiling. These studies provide the essential metrological foundation to address frontier issues in surface and nanoanalysis and extend the measurement capabilities ofToF-SIMS.
Book Synopsis Multivariate Statistical Analysis of Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) Raw Data Files by :
Download or read book Multivariate Statistical Analysis of Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) Raw Data Files written by and published by . This book was released on 2007 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Accounting for the Dead Time in Analysis of Time of Flight Secondary Ion Mass Spectrometry Data by : Negar Shahrokhesfahani
Download or read book Accounting for the Dead Time in Analysis of Time of Flight Secondary Ion Mass Spectrometry Data written by Negar Shahrokhesfahani and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Time of Flight Secondary Ion Mass Spectrometry (ToF SIMS) is a powerful tool for advanced surface analysis. It produces large data sets, which consist of mass spectra at each pixel at an imaged area. Many ToF SIMS instruments use a type of detector that suffers from two problems that lead to non-linearity in the measured sample properties: detector saturation and dead time. Linearity in this type of system is defined as the proportionality of the measured and true ion counts. Non-linearity can influence the interpretation of the data with methods such as multivariate analysis. "Detector saturation" happens when more than one ion arrives at the detector in the time interval related to one specific channel but the detector records only a single count. "Dead time" is when one event happens at a certain channel and the detector become insensitive to subsequent ions arriving within the dead time window. These problems both lead to under-counting of ions. In this thesis, we mainly focus on correcting for the dead time effects. Using extensive simulations, we first characterize the adverse effects of dead time on the output and evaluate quality of existing ways to "correct" for dead time effects. Then, we propose a novel method using the Maximum Likelihood Estimation (MLE) to estimate the true spectrum for the measured data. Specifically, we incorporate the statistical distribution of the dead time affected data in MLE, which leads to a new method for dead time correction.
Download or read book Comprehensive Chemometrics written by and published by Elsevier. This book was released on 2009-03-09 with total page 2880 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to serve as the first point of reference on the subject, Comprehensive Chemometrics presents an integrated summary of the present state of chemical and biochemical data analysis and manipulation. The work covers all major areas ranging from statistics to data acquisition, analysis, and applications. This major reference work provides broad-ranging, validated summaries of the major topics in chemometrics—with chapter introductions and advanced reviews for each area. The level of material is appropriate for graduate students as well as active researchers seeking a ready reference on obtaining and analyzing scientific data. Features the contributions of leading experts from 21 countries, under the guidance of the Editors-in-Chief and a team of specialist Section Editors: L. Buydens; D. Coomans; P. Van Espen; A. De Juan; J.H. Kalivas; B.K. Lavine; R. Leardi; R. Phan-Tan-Luu; L.A. Sarabia; and J. Trygg Examines the merits and limitations of each technique through practical examples and extensive visuals: 368 tables and more than 1,300 illustrations (750 in full color) Integrates coverage of chemical and biological methods, allowing readers to consider and test a range of techniques Consists of 2,200 pages and more than 90 review articles, making it the most comprehensive work of its kind Offers print and online purchase options, the latter of which delivers flexibility, accessibility, and usability through the search tools and other productivity-enhancing features of ScienceDirect
Book Synopsis The Practice of TOF-SIMS by : Alan M. Spool
Download or read book The Practice of TOF-SIMS written by Alan M. Spool and published by Momentum Press. This book was released on 2016-03-24 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time of flight secondary ion mass spectrometry, TOF-SIMS, is a highly surface sensitive analytical technique that provides information about composition with submicron lateral resolution. For select materials, TOF-SIMS provides unparalleled sensitivity along with excellent reproducibility, and as a mass spectrometric technique, it also provides excellent specificity. Of the analytical methods available, it is among the most surface sensitive, but the physical principles that underlie it are also the least understood. This volume describes the instrumentation, the physical principles behind the technique to the extent they are understood, and provides a practical approach for the interpretation of TOF-SIMS data. The use of advanced data processing methods such as multivariate statistics are described in a readily approachable manner. Given a basic background in undergraduate chemistry and physics, the book will be of use to any student with an interest in the technique.
Book Synopsis Campaign 1.7 Pu Aging. Development of Time of Flight Secondary Ion Mass Spectroscopy by :
Download or read book Campaign 1.7 Pu Aging. Development of Time of Flight Secondary Ion Mass Spectroscopy written by and published by . This book was released on 2015 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first application of Time-of-Flight Secondary Ion Mass Spectroscopy (ToF-SIMS) to an aged plutonium surface has resulted in a rich set of surface chemistry data, as well as some unexpected results. FY15 was highlighted by not only the first mapping of hydrogen-containing features within the metal, but also a prove-in series of experiments using the system's Sieverts Reaction Cell. These experiments involved successfully heating the sample to ~450 oC for nearly 24 hours while the sample was dosed several times with hydrogen, followed by an in situ ToF-SIMS analysis. During this year, the data allowed for better and more consistent identification of the myriad peaks that result from the SIMS sputter process. In collaboration with the AWE (U.K), the system was also fully aligned for sputter depth profiling for future experiments.
Book Synopsis Processing Metabolomics and Proteomics Data with Open Software by : Robert Winkler
Download or read book Processing Metabolomics and Proteomics Data with Open Software written by Robert Winkler and published by Royal Society of Chemistry. This book was released on 2020-03-19 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metabolomics and proteomics allow deep insights into the chemistry and physiology of biological systems. This book expounds open-source programs, platforms and programming tools for analysing metabolomics and proteomics mass spectrometry data. In contrast to commercial software, open-source software is created by the academic community, which facilitates the direct interaction between users and developers and accelerates the implementation of new concepts and ideas. The first section of the book covers the basics of mass spectrometry, experimental strategies, data operations, the open-source philosophy, metabolomics, proteomics and statistics/ data mining. In the second section, active programmers and users describe available software packages. Included tutorials, datasets and code examples can be used for training and for building custom workflows. Finally, every reader is invited to participate in the open science movement.
Book Synopsis Application of Time-of-flight Secondary Ion Mass Spectrometry to Cellular Analysis by : Matthew J. Baker
Download or read book Application of Time-of-flight Secondary Ion Mass Spectrometry to Cellular Analysis written by Matthew J. Baker and published by . This book was released on 2007 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Analysis by : J. C. Vickerman
Download or read book Surface Analysis written by J. C. Vickerman and published by . This book was released on 1997 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Application of Time-in-flight Secondary Ion Mass Spectrometry for the Analysis of Overlapping Fingerprints and Inks by : Nicholas J. Bright
Download or read book The Application of Time-in-flight Secondary Ion Mass Spectrometry for the Analysis of Overlapping Fingerprints and Inks written by Nicholas J. Bright and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sample Preparation in Metabolomics by : Julia Kuligowski
Download or read book Sample Preparation in Metabolomics written by Julia Kuligowski and published by MDPI. This book was released on 2021-04-07 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metabolomics is increasingly being used to explore the dynamic responses of living systems in biochemical research. The complexity of the metabolome is outstanding, requiring the use of complementary analytical platforms and methods for its quantitative or qualitative profiling. In alignment with the selected analytical approach and the study aim, sample collection and preparation are critical steps that must be carefully selected and optimized to generate high-quality metabolomic data. This book showcases some of the most recent developments in the field of sample preparation for metabolomics studies. Novel technologies presented include electromembrane extraction of polar metabolites from plasma samples and guidelines for the preparation of biospecimens for the analysis with high-resolution μ magic-angle spinning nuclear magnetic resonance (HR-μMAS NMR). In the following chapters, the spotlight is on sample preparation approaches that have been optimized for diverse bioanalytical applications, including the analysis of cell lines, bacteria, single spheroids, extracellular vesicles, human milk, plant natural products and forest trees.
Book Synopsis Ion Dissociation in the Drift Tube of a Time-of-flight Mass Spectrometer by : W. W. Hunt
Download or read book Ion Dissociation in the Drift Tube of a Time-of-flight Mass Spectrometer written by W. W. Hunt and published by . This book was released on 1964 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applying screened trapezoidal potential barriers in the drift tube of a time-of-flight mass spectrometer produces flighttime shifts that can be used to separate and identify products of ion dissociation processes occurring between the ion source and the potential barrier. The flight-time shift is a function of the retarder voltage and mass-to-charge ratios of the fragment and parent ions, expressed by the flight-time shift equation. When the retarder voltage is known, analytic solu tions of this equation allow the retarded ions (fragment or parent) to be identified from the measured flight-time shifts. When the mass-to-charge ratios of these ions are known, similar solutions allow the retarder voltage that will produce a given flight-time shift to be predicted. For part IV see AD-429 438. (Author).
Download or read book ToF-SIMS written by J. C. Vickerman and published by IM Publications. This book was released on 2013 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is the most versatile of the surface analysis techniques that have been developed during the last 30 years. This is the Second Edition of the first book ToF-SIMS: Surface analysis by Mass Spectrometry to be dedicated to the subject and the treatment is comprehensive
Book Synopsis New Insights in Impact Ionization and in Time-of-flight Mass Spectroscopy with Micrometeoroid Detectors by Improved Impact Simulations in the Laboratory by :
Download or read book New Insights in Impact Ionization and in Time-of-flight Mass Spectroscopy with Micrometeoroid Detectors by Improved Impact Simulations in the Laboratory written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present thesis deals with the impact ionization processes appearing at hypervelocity impacts of microparticles on solid surfaces. With a newly developed dust particle source, applied to the Heidelberg Dust Accelerator facility, aluminium, carbon, sodium contaminated carbon, iron and latex projectiles were shot on the micrometeorite detectors CDA and CIDA. The projectile masses cover a range of 10^-18 to 10^-12 kg, the projectile densities a range of 1100 - 7900 kg/m^3 and the impact speeds a range of 2 - 70 km/s. The resulting data show different impact ionization processes depending on the impact speeds: for low speeds (v 6 km/s) dominates surface ionization of target contaminants, for high speeds (v 18 km/s) volume ionization of the target and projectile material is dominating. The charge yield in the intermediate impact speed regime shows a reduced increase due to energy consumption by melting and vaporization processes. Time-of-flight mass spectroscopy, provided by both instruments, enabled the investigation of the chemical composition of the impact plasma depending on the projectile type and on the impact speed. Alkaline ions (Na, K) dominate the mass spectra at low impact speeds. For higher impact speeds appear target ions (Rh), projectile material related ions and hydrogen ions (H). The systematics of characteristic atomic and molecular ion species in the mass spectra helps to get clues on the chemical nature of unknown projectiles in space. An improved model on specific ion yields can be given. Furthermore a lot of results which are important for the instrument calibration and the understanding of flight data, like global charge yields, rise times and sensitivities were obtained. First measurements on the inner instrument wall region are provided.
