Principles And Applications Of Ion Scattering Spectrometry

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Principles and Applications of Ion Scattering Spectrometry

Author : J. Wayne Rabalais
Publisher : Wiley-Interscience
ISBN 13 :
Total Pages : 350 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Principles and Applications of Ion Scattering Spectrometry by : J. Wayne Rabalais

Download or read book Principles and Applications of Ion Scattering Spectrometry written by J. Wayne Rabalais and published by Wiley-Interscience. This book was released on 2003 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first authoritative account of ion scattering spectrometry for both students and researchers Ion scattering spectrometry, a powerful analytical tool used to determine the structure and composition of a substance, addresses critical problems in semiconductors, thin film growth, coatings, computer chips, magnetic storage devices, bioreactive surfaces, catalytic surfaces, and electrochemical surfaces (including the large battery industry). Principles and Applications of Ion Scattering Spectrometry: Surface Chemical and Structural Analysis represents the first and only book on this exciting field, seamlessly merging theoretical fundamentals with cutting-edge practical applications. Author J. Wayne Rabalais, the world's leading expert in ion scattering spectrometry, recognizes both the pedagogic and research needs of such a text and divides his work accordingly. Chapters 1 through 5 address senior undergraduates and beginning graduate students in chemical physics and include figures and illustrative diagrams intended to exemplify the discussions. Chapters 6 through 9 comprise material on the brink of current research and contain specific references to other sources at the end of each; further, chapter 10 is a bibliography of ion scattering publications. Topics covered include: * Introductory, theoretical, and experimental aspects of ion scattering * General features and structural analysis * The recent technique of scattering and recoiling imaging spectrometry * Examples of structural analysis * Ion-surface charge exchange phenomena * Hyperthermal ion-surface interactions Engineers, researchers, professors, and postdoctoral associates involved in surface analysis, surface science, and studies of surfaces of materials will find Rabalais' incomparable study a seminal moment in the advance of ion scattering spectrometry.

Monitoring Forest Damage with Mass Spectrometry-Based Metabolomics Methods

Author : Carla Antonio
Publisher : John Wiley & Sons
ISBN 13 : 1119868726
Total Pages : 468 pages
Book Rating : 4.1/5 (198 download)

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Book Synopsis Monitoring Forest Damage with Mass Spectrometry-Based Metabolomics Methods by : Carla Antonio

Download or read book Monitoring Forest Damage with Mass Spectrometry-Based Metabolomics Methods written by Carla Antonio and published by John Wiley & Sons. This book was released on 2024-02-21 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understand forest responses to climate change with this timely introduction Forests are among the most critical parts of our global ecosystem, responsible for the air we breathe, home to most of the earth’s species, and crucial sources of food and raw materials. Forest development is therefore one of the most important areas of ecological study, and damage to forests is potentially existential. Metabolomics, a toolkit which accrues data on interactions between genetic and environmental conditions, promises to advance our understanding of how these vital ecosystems respond to dramatic changes in climate and environment. Monitoring Forest Damage with Mass Spectrometry-Based Metabolomics Methods offers a thorough, accessible discussion of metabolomic techniques and their applications in forest tree research. It promises to enrich the reader’s understanding of how forests are being transformed by globe-spanning changes, and to arm researchers with tools for reacting to these potentially epochal developments. Monitoring Forest Damage with Mass Spectrometry-Based Metabolomics Methods readers will also find: Analysis of specialized secondary metabolites such as phytohormones Detailed discussion of ecologically important tree genera such as Pinus, Populus, Quercus, and many more Supplementary materials related to study design, sample preparation, and instrumental analysis protocols Monitoring Forest Damage with Mass Spectrometry-Based Metabolomics Methods is ideal for researchers in analytical chemistry, mass spectrometry, metabolomics, forest research, the life sciences, and all other related fields.

Mass Spectrometry Handbook

Author : Mike S. Lee
Publisher : John Wiley & Sons
ISBN 13 : 1118180720
Total Pages : 1362 pages
Book Rating : 4.1/5 (181 download)

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Book Synopsis Mass Spectrometry Handbook by : Mike S. Lee

Download or read book Mass Spectrometry Handbook written by Mike S. Lee and published by John Wiley & Sons. This book was released on 2012-04-16 with total page 1362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to its enormous sensitivity and ease of use, mass spectrometry has grown into the analytical tool of choice in most industries and areas of research. This unique reference provides an extensive library of methods used in mass spectrometry, covering applications of mass spectrometry in fields as diverse as drug discovery, environmental science, forensic science, clinical analysis, polymers, oil composition, doping, cellular research, semiconductor, ceramics, metals and alloys, and homeland security. The book provides the reader with a protocol for the technique described (including sampling methods) and explains why to use a particular method and not others. Essential for MS specialists working in industrial, environmental, and clinical fields.

Ion Spectroscopies for Surface Analysis

Author : Alvin W. Czanderna
Publisher : Springer Science & Business Media
ISBN 13 : 1461537088
Total Pages : 479 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Ion Spectroscopies for Surface Analysis by : Alvin W. Czanderna

Download or read book Ion Spectroscopies for Surface Analysis written by Alvin W. Czanderna and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Determining the elemental composition of surfaces is an essential measurement in characterizing solid surfaces. At present, many ap proaches may be applied for measuring the elemental and molecular composition of a surface. Each method has particular strengths and limitations that often are directly connected to the physical processes involved. Typically, atoms and molecules on the surface and in the near surface region may be excited by photons, electrons, ions, or neutrals, and the detected particles are emitted, ejected, or scattered ions or electrons. The purpose of this book is to bring together a discussion of the surface compositional analysis that depends on detecting scattered or sputtered ions, and the methods emphasized are those where instruments are commercially available for carrying out the analysis. For each topic treated, the physical principles, instrumentation, qualitative analysis, artifacts, quantitative analysis, applications, opportunities, and limita tions are discussed. The first chapter provides an overview of the role of elemental composition in surface science; compositional depth profiling; stimulation by an electric field, electrons, neutrals, or photons and detection of ions; and then stimulation by ions, and detection of ions, electrons, photons, or neutrals.

Chemical Analysis of Antibiotic Residues in Food

Author : Jian Wang
Publisher : John Wiley & Sons
ISBN 13 : 1118067193
Total Pages : 378 pages
Book Rating : 4.1/5 (18 download)

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Book Synopsis Chemical Analysis of Antibiotic Residues in Food by : Jian Wang

Download or read book Chemical Analysis of Antibiotic Residues in Food written by Jian Wang and published by John Wiley & Sons. This book was released on 2011-11-29 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: An insightful exploration of the key aspects concerning the chemical analysis of antibiotic residues in food The presence of excess residues from frequent antibiotic use in animals is not only illegal, but can pose serious health risks by contaminating products for human consumption such as meat and milk. Chemical Analysis of Antibiotic Residues in Food is a single-source reference for readers interested in the development of analytical methods for analyzing antibiotic residues in food. It covers themes that include quality assurance and quality control, antibiotic chemical properties, pharmacokinetics, metabolism, distribution, food safety regulations, and chemical analysis. In addition, the material presented includes background information valuable for understanding the choice of marker residue and target animal tissue to use for regulatory analysis. This comprehensive reference: Includes topics on general issues related to screening and confirmatory methods Presents updated information on food safety regulation based on routine screening and confirmatory methods, especially LC-MS Provides general guidance for method development, validation, and estimation of measurement uncertainty Chemical Analysis of Antibiotic Residues in Food is written and organized with a balance between practical use and theory to provide laboratories with a solid and reliable reference on antibiotic residue analysis. Thorough coverage elicits the latest scientific findings to assist the ongoing efforts toward refining analytical methods for producing safe foods of animal origin.

Mass Spectrometry

Author : Agnieszka Kraj
Publisher : John Wiley & Sons
ISBN 13 : 047039580X
Total Pages : 358 pages
Book Rating : 4.4/5 (73 download)

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Book Synopsis Mass Spectrometry by : Agnieszka Kraj

Download or read book Mass Spectrometry written by Agnieszka Kraj and published by John Wiley & Sons. This book was released on 2008-12-01 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from noted experts from Europe and North America, Mass Spectrometry Instrumentation, Interpretation, and Applications serves as a forum to introduce students to the whole world of mass spectrometry and to the many different perspectives that each scientific field brings to its use. The book emphasizes the use of this important analytical technique in many different fields, including applications for organic and inorganic chemistry, forensic science, biotechnology, and many other areas. After describing the history of mass spectrometry, the book moves on to discuss instrumentation, theory, and basic applications.

Mass Spectrometry

Author : Marek Smoluch
Publisher : John Wiley & Sons
ISBN 13 : 111937734X
Total Pages : 361 pages
Book Rating : 4.1/5 (193 download)

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Book Synopsis Mass Spectrometry by : Marek Smoluch

Download or read book Mass Spectrometry written by Marek Smoluch and published by John Wiley & Sons. This book was released on 2019-06-17 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive description of mass spectrometry basics, applications, and perspectives Mass spectrometry is a modern analytical technique, allowing for fast and ultrasensitive detection and identification of chemical species. It can serve for analysis of narcotics, counterfeit medicines, components of explosives, but also in clinical chemistry, forensic research and anti-doping analysis, for identification of clinically relevant molecules as biomarkers of various diseases. This book describes everything readers need to know about mass spectrometry—from the instrumentation to the theory and applications. It looks at all aspects of mass spectrometry, including inorganic, organic, forensic, and biological MS (paying special attention to various methodologies and data interpretation). It also contains a list of key terms for easier and faster understanding of the material by newcomers to the subject and test questions to assist lecturers. Knowing how crucial it is for young researchers to fully understand both the power of mass spectrometry and the importance of other complementary methodologies, Mass Spectrometry: An Applied Approach teaches that it should be used in conjunction with other techniques such as NMR, pharmacological tests, structural identification, molecular biology, in order to reveal the true function(s) of the identified molecule. Provides a description of mass spectrometry basics, applications and perspectives of the technique Oriented to a broad audience with limited or basic knowledge in mass spectrometry instrumentation, theory, and its applications in order to enhance their competence in this field Covers all aspects of mass spectrometry, including inorganic, organic, forensic, and biological MS with special attention to application of various methodologies and data interpretation Includes a list of key terms, and test questions, for easier and faster understanding of the material Mass Spectrometry: An Applied Approach is highly recommended for advanced students, young scientists, and anyone involved in a field that utilizes the technique.

Mass Spectrometry in Sports Drug Testing

Author : Mario Thevis
Publisher : John Wiley & Sons
ISBN 13 : 1118035143
Total Pages : 294 pages
Book Rating : 4.1/5 (18 download)

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Book Synopsis Mass Spectrometry in Sports Drug Testing by : Mario Thevis

Download or read book Mass Spectrometry in Sports Drug Testing written by Mario Thevis and published by John Wiley & Sons. This book was released on 2010-12-13 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enables you to detect, identify, and characterize hundreds of drugs that may be used by athletes Mass spectrometry has become essential to sports drug testing. This book examines both the principles of sports drug testing and the use of mass spectrometry techniques and mass spectral data to detect, identify, and characterize hundreds of known and unknown drugs that athletes may use to enhance their performance. The author provides a detailed overview of the mass spectrometry of numerous classes of therapeutics and agents, various analyzers to detect low- and high-molecular weight drugs, as well as techniques to discriminate between endogenously produced and synthetically derived compounds. Mass Spectrometry in Sports Drug Testing begins with a full chapter dedicated to the history of sports drug testing. Next, the book provides the principles and techniques needed to maximize the specificity and sensitivity of mass spectrometric assays, including: Detailed, step-by-step assays with sample preparation Discussion of both chromatographic separation and mass spectrometric analysis Characterization of analytes in order to unequivocally identify banned substances Mass spectrometric behavior of low- and high-molecular weight analytes Throughout the book, descriptive examples illustrate the principles, advantages, and limitations of different assays. Mass Spectrometry in Sports Drug Testing not only sets forth the role mass spectrometry plays in detecting drug use among athletes, it also adds new insights into the health and ethical issues of doping in sports.

Mass Spectrometry in Grape and Wine Chemistry

Author : Riccardo Flamini
Publisher : John Wiley & Sons
ISBN 13 : 0470552913
Total Pages : 365 pages
Book Rating : 4.4/5 (75 download)

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Book Synopsis Mass Spectrometry in Grape and Wine Chemistry by : Riccardo Flamini

Download or read book Mass Spectrometry in Grape and Wine Chemistry written by Riccardo Flamini and published by John Wiley & Sons. This book was released on 2009-12-23 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concise, up-to-date overview of the applications of mass spectrometry To be able to estimate the potentiality of grapes and how it may be transferred into wine is key to grasping enological chemistry. Nowadays, mass spectrometry is a crucial aspect in ensuring the production, the quality, and the safety of grape, wine, and grape derivative products. Mass Spectrometry in Grape and Wine Chemistry examines in depth the relationship between the high structural identification power of mass spectrometry techniques and the chemistry of grapes and wine. The text is divided into two parts. The first section provides an overview of mass spectrometry methods in relation to enology in three chapters. The second section offers seven chapters on wine chemistry as well as traditional topics and new developments in mass spectrometry. Mass Spectrometry in Grape and Wine Chemistry explores many mass spectrometry applications, including: Ionization methods Mass analyzers and mass measurements Mass spectrometry methodologies Grape aroma compounds Volatile and aroma compounds in wines Grape and wine polyphenols Compounds released by wood into wine Wine defects caused by compounds Pesticide detection analysis Peptides and proteins of grape and wine Written by leading experts in the field, this book presents an introduction to mass spectrometry and outlines ways to maximize quality control and product safety for the best results. Mass Spectrometry in Grape and Wine Chemistry is an essential handbook for laboratories working in enology.

Protein Carbonylation

Author : Joaquim Ros
Publisher : John Wiley & Sons
ISBN 13 : 1119374960
Total Pages : 416 pages
Book Rating : 4.1/5 (193 download)

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Book Synopsis Protein Carbonylation by : Joaquim Ros

Download or read book Protein Carbonylation written by Joaquim Ros and published by John Wiley & Sons. This book was released on 2017-05-05 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Protein carbonylation has attracted the interest of a great number of laboratories since the pioneering studies at the Earl Stadtman’s lab at NIH started in early 1980s. Since then, detecting protein carbonyls in oxidative stress situations became a highly efficient tool to uncover biomarkers of oxidative damage in normal and altered cell physiology. In this book, research groups from several areas of interest have contributed to update the knowledge regarding detection, analyses and identification of carbonylated proteins and the sites where these modifications occur. The scientific community will benefit from these reviews since they deal with specific, detailed technical approaches to study formation and detection of protein carbonyls. Moreover, the biological impact of such modifications in metabolic, physiologic and structural functions and, how these alterations can help understanding the downstream effects on cell function are discussed. Oxidative stress occurs in all living organisms and affects proteins and other macromolecules: Protein carbonylation is a measure of oxidative stress in biological systems Mass spectrometry, fluorescent labelling, antibody based detection, biotinylated protein selection and other methods for detecting protein carbonyls and modification sites in proteins are described Aging, neurodegenerative diseases, obstructive pulmonary diseases, malaria, cigarette smoke, adipose tissue and its relationship with protein carbonylation Direct oxidation, glycoxidation and modifications by lipid peroxidation products as protein carbonylation pathways Emerging methods for characterizing carbonylated protein networks and affected metabolic pathways

Mass Spectrometry and Stable Isotopes in Nutritional and Pediatric Research

Author : Henk Schierbeek
Publisher : John Wiley & Sons
ISBN 13 : 1119341248
Total Pages : 416 pages
Book Rating : 4.1/5 (193 download)

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Book Synopsis Mass Spectrometry and Stable Isotopes in Nutritional and Pediatric Research by : Henk Schierbeek

Download or read book Mass Spectrometry and Stable Isotopes in Nutritional and Pediatric Research written by Henk Schierbeek and published by John Wiley & Sons. This book was released on 2017-01-23 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide for scientists, pediatricians and students involved in metabolic studies in pediatric research Addresses the availability of modern analytical techniques and how to apply these techniques in metabolic studies Covers the whole range of available mass spectrometric techniques used for metabolic studies including Stable Isotope Methodology Presents the relevance of mass spectrometry and stable isotope methodology in pediatric research covering applications in Nutrition, Obesity, Metabolic Disorders, and Kidney Disorders Focuses on the interactions between nutrients and the endogenous metabolism within the body and how these factors affect the health of a growing infant

Lipidomics

Author : Xianlin Han
Publisher : John Wiley & Sons
ISBN 13 : 1118893123
Total Pages : 48 pages
Book Rating : 4.1/5 (188 download)

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Book Synopsis Lipidomics by : Xianlin Han

Download or read book Lipidomics written by Xianlin Han and published by John Wiley & Sons. This book was released on 2016-05-02 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers the area of lipidomics from fundamentals and theory to applications Presents a balanced discussion of the fundamentals, theory, experimental methods and applications of lipidomics Covers different characterizations of lipids including Glycerophospholipids; Sphingolipids; Glycerolipids and Glycolipids; and Fatty Acids and Modified Fatty Acids Includes a section on quantification of Lipids in Lipidomics such as sample preparation; factors affecting accurate quantification; and data processing and interpretation Details applications of Lipidomics Tools including for Health and Disease; Plant Lipidomics; and Lipidomics on Cellular Membranes

Illicit Drugs in the Environment

Author : Sara Castiglioni
Publisher : John Wiley & Sons
ISBN 13 : 1118008995
Total Pages : 449 pages
Book Rating : 4.1/5 (18 download)

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Book Synopsis Illicit Drugs in the Environment by : Sara Castiglioni

Download or read book Illicit Drugs in the Environment written by Sara Castiglioni and published by John Wiley & Sons. This book was released on 2011-02-14 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Illicit drugs are an emerging class of environmental contaminants and mass spectrometry is the technique of choice for their analysis. This landmark reference discusses the analytical techniques used to detect illicit drugs in wastewater and surface water, details how to estimate the levels of contaminants in the environment, and explores the behavior, fate, and toxic effects of this new class of contaminants, now a ubiquitous presence in wastewater and surface water. The book details how an estimate of illicit drug consumption in a given population can be developed from an analysis of the residues of illicit drugs in wastewater. An important resource for analytical chemists, environmental researchers, forensic scientists, biologists, and toxicologists.

Fundamentals of Industrial Catalytic Processes

Author : C. H. Bartholomew
Publisher : John Wiley & Sons
ISBN 13 : 1118209737
Total Pages : 1224 pages
Book Rating : 4.1/5 (182 download)

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Book Synopsis Fundamentals of Industrial Catalytic Processes by : C. H. Bartholomew

Download or read book Fundamentals of Industrial Catalytic Processes written by C. H. Bartholomew and published by John Wiley & Sons. This book was released on 2011-11-30 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis is central to the chemical industry, as it is directly or involved in the production of almost all useful chemical products. In this book the authors, present the definitive account of industrial catalytic processes. Throughout Fundamentals of Industrial Catalytic Processes the information is illustrated with many case studies and problems. This book is valuable to anyone wanting a clear account of industrial catalytic processes, but is particularly useful to industrial and academic chemists and engineers and graduate working on catalysis. This book also: Covers fundamentals of catalytic processes, including chemistry, catalyst preparation, properties and reaction engineering. Addresses heterogeneous catalytic processes employed by industry. Provides detailed data on existing catalysts and catalytic reactions, process design and chemical engineering. Covers catalysts used in fuel cells.

Functionalization of Semiconductor Surfaces

Author : Franklin Tao
Publisher : John Wiley & Sons
ISBN 13 : 0470562943
Total Pages : 456 pages
Book Rating : 4.4/5 (75 download)

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Book Synopsis Functionalization of Semiconductor Surfaces by : Franklin Tao

Download or read book Functionalization of Semiconductor Surfaces written by Franklin Tao and published by John Wiley & Sons. This book was released on 2012-04-10 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents both fundamental knowledge and latest achievements of this rapidly growing field in the last decade. It presents a complete and concise picture of the the state-of-the-art in the field, encompassing the most active international research groups in the world. Led by contributions from leading global research groups, the book discusses the functionalization of semiconductor surface. Dry organic reactions in vacuum and wet organic chemistry in solution are two major categories of strategies for functionalization that will be described. The growth of multilayer-molecular architectures on the formed organic monolayers will be documented. The immobilization of biomolecules such as DNA on organic layers chemically attached to semiconductor surfaces will be introduced. The patterning of complex structures of organic layers and metallic nanoclusters toward sensing techniques will be presented as well.

Handbook of Spectroscopy

Author : G¿nter Gauglitz
Publisher : John Wiley & Sons
ISBN 13 : 3527654720
Total Pages : 2011 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Handbook of Spectroscopy by : G¿nter Gauglitz

Download or read book Handbook of Spectroscopy written by G¿nter Gauglitz and published by John Wiley & Sons. This book was released on 2014-05-05 with total page 2011 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second, thoroughly revised, updated and enlarged edition provides a straightforward introduction to spectroscopy, showing what it can do and how it does it, together with a clear, integrated and objective account of the wealth of information that may be derived from spectra. It also features new chapters on spectroscopy in nano-dimensions, nano-optics, and polymer analysis. Clearly structured into sixteen sections, it covers everything from spectroscopy in nanodimensions to medicinal applications, spanning a wide range of the electromagnetic spectrum and the physical processes involved, from nuclear phenomena to molecular rotation processes. In addition, data tables provide a comparison of different methods in a standardized form, allowing readers to save valuable time in the decision process by avoiding wrong turns, and also help in selecting the instrumentation and performing the experiments. These four volumes are a must-have companion for daily use in every lab.

Treatise on Heavy-Ion Science

Author : D.A. Bromley
Publisher : Springer Science & Business Media
ISBN 13 : 1461581036
Total Pages : 446 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Treatise on Heavy-Ion Science by : D.A. Bromley

Download or read book Treatise on Heavy-Ion Science written by D.A. Bromley and published by Springer Science & Business Media. This book was released on 2012-11-27 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: For 75 years the stopping of energetic ions in matter has been a subject of great theoretical and experimental interest. The theoretical treatment of the stopping of ions in matter is largely due to the work of Bohr, 1-3 Bethe,4-6 Bloch,7. s and Lindhard,9-12 and it has been reviewed by Bohr,3 Fano,13 17 20 Jackson,14 Sigmund,15 Ahlen,16 and Ziegler et al. - Soon after the discovery of energetic particle emission from radioactive materials, there was interest in how these corpuscles were slowed down in traversing matter. In 1900, Marie Curie stated 21 the hypothesis that Hies rayons alpha sont des projectiles materiels susceptibles de perdre de leur vitesse en travers ant la matiere." Early attempts to evaluate this were incon clusive for there was not yet an accurate proposed model of the atom. Enough experimental evidence was collected in the next decade to make stopping power theory one of the central concerns of those attempting to develop an atomic model. J.J. Thomson, director of the prestigious Cavendish Laboratory, and Niels Bohr, a fresh postdoctoral scientist at Rutherford's Manchester Laboratory, both published almost simultaneously22. 23 an analysis of the stopping of charged particles by matter, and each contained many of their divergent ideas on the model of an atom. Thomson ignored in his paper the Rutherford alpha-particle scattering 24 experiment of a year before. But the nuclear atom with a heavy positively 25 charged core was the basis of Bohr's ideas.