High Resolution X-ray Fluorescence Spectroscopy - a New Technique for Site- and Spin-selectivity

High Resolution X-ray Fluorescence Spectroscopy - a New Technique for Site- and Spin-selectivity
Author:
Publisher:
Total Pages: 207
Release: 1996
Genre:
ISBN:

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X-ray spectroscopy has long been used to elucidate electronic and structural information of molecules. One of the weaknesses of x-ray absorption is its sensitivity to all of the atoms of a particular element in a sample. Through out this thesis, a new technique for enhancing the site- and spin-selectivity of the x-ray absorption has been developed. By high resolution fluorescence detection, the chemical sensitivity of K emission spectra can be used to identify oxidation and spin states; it can also be used to facilitate site-selective X-ray Absorption Near Edge Structure (XANES) and site-selective Extended X-ray Absorption Fine Structure (EXAFS). The spin polarization in K fluorescence could be used to generate spin selective XANES or spin-polarized EXAFS, which provides a new measure of the spin density, or the nature of magnetic neighboring atoms. Finally, dramatic line-sharpening effects by the combination of absorption and emission processes allow observation of structure that is normally unobservable. All these unique characters can enormously simplify a complex x-ray spectrum. Applications of this novel technique have generated information from various transition-metal model compounds to metalloproteins. The absorption and emission spectra by high resolution fluorescence detection are interdependent. The ligand field multiplet model has been used for the analysis of K[alpha] and K[beta] emission spectra. First demonstration on different chemical states of Fe compounds has shown the applicability of site selectivity and spin polarization. Different interatomic distances of the same element in different chemical forms have been detected using site-selective EXAFS.

X-Ray Fluorescence Spectroscopy for Laboratory Applications

X-Ray Fluorescence Spectroscopy for Laboratory Applications
Author: Michael Haschke
Publisher: John Wiley & Sons
Total Pages: 496
Release: 2021-01-12
Genre: Science
ISBN: 3527816607

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Provides comprehensive coverage on using X-ray fluorescence for laboratory applications This book focuses on the practical aspects of X-ray fluorescence (XRF) spectroscopy and discusses the requirements for a successful sample analysis, such as sample preparation, measurement techniques and calibration, as well as the quality of the analysis results. X-Ray Fluorescence Spectroscopy for Laboratory Applications begins with a short overview of the physical fundamentals of the generation of X-rays and their interaction with the sample material, followed by a presentation of the different methods of sample preparation in dependence on the quality of the source material and the objective of the measurement. After a short description of the different available equipment types and their respective performance, the book provides in-depth information on the choice of the optimal measurement conditions and the processing of the measurement results. It covers instrument types for XRF; acquisition and evaluation of X-Ray spectra; analytical errors; analysis of homogeneous materials, powders, and liquids; special applications of XRF; process control and automation. An important resource for the analytical chemist, providing concrete guidelines and support for everyday analyses Focuses on daily laboratory work with commercially available devices Offers a unique compilation of knowledge and best practices from equipment manufacturers and users Covers the entire work process: sample preparation, the actual measurement, data processing, assessment of uncertainty, and accuracy of the obtained results X-Ray Fluorescence Spectroscopy for Laboratory Applications appeals to analytical chemists, analytical laboratories, materials scientists, environmental chemists, chemical engineers, biotechnologists, and pharma engineers.

X-Ray Fluorescence Spectrometry

X-Ray Fluorescence Spectrometry
Author: Ron Jenkins
Publisher: John Wiley & Sons
Total Pages: 1
Release: 2012-08-29
Genre: Science
ISBN: 1118521048

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X-ray fluorescence spectroscopy, one of the most powerful and flexible techniques available for the analysis and characterization of materials today, has gone through major changes during the past decade. Fully revised and expanded by 30%, X-Ray Fluorescence Spectrometry, Second Edition incorporates the latest industrial and scientific trends in all areas. It updates all previous material and adds new chapters on such topics as the history of X-ray fluorescence spectroscopy, the design of X-ray spectrometers, state-of-the-art applications, and X-ray spectra. Ron Jenkins draws on his extensive experience in training and consulting industry professionals for this clear and concise treatment, covering first the basic aspects of X rays, then the methodology of X-ray fluorescence spectroscopy and available instrumentation. He offers a comparison between wavelength and energy dispersive spectrometers as well as step-by-step guidelines to X-ray spectrometric techniques for qualitative and quantitative analysis-from specimen preparation to real-world industrial application. Favored by the American Chemical Society and the International Centre for Diffraction Data, X-Ray Fluorescence Spectrometry, Second Edition is an ideal introduction for newcomers to the field and an invaluable reference for experienced spectroscopists-in chemical analysis, geology, metallurgy, and materials science. An up-to-date review of X-ray spectroscopic techniques. This proven guidebook for industry professionals is thoroughly updated and expanded to reflect advances in X-ray analysis over the last decade. X-Ray Fluorescence Spectrometry, Second Edition includes: The history of X-ray fluorescence spectrometry-new to this edition. A critical review of the most useful X-ray spectrometers. Techniques and procedures for quantitative and qualitative analysis. Modern applications and industrial trends. X-ray spectra-new to this edition.

Laboratory Micro-X-Ray Fluorescence Spectroscopy

Laboratory Micro-X-Ray Fluorescence Spectroscopy
Author: Michael Haschke
Publisher: Springer Science & Business Media
Total Pages: 367
Release: 2014-05-08
Genre: Science
ISBN: 3319048643

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Micro-X-ray fluorescence offers the possibility for a position- sensitive and non-destructive analysis that can be used for the analysis of non-homogeneous materials and layer systems. This analytical technique has shown a dynamic development in the last 15 years and is used for the analysis of small particles, inclusions, of elemental distributions for a wide range of different applications both in research and quality control. The first experiments were performed on synchrotrons but there is a requirement for laboratory instruments which offers a fast and immediate access for analytical results. The book discuss the main components of a μ-XRF instrument and the different measurement modes, it gives an overview about the various instruments types, considers the special requirements for quantification of non-homogeneous materials and presents a wide range of application for single point and multi-point analysis as well as for distribution analysis in one, two and three dimensions.

X-Ray Fluorescence Spectrometry and Related Techniques

X-Ray Fluorescence Spectrometry and Related Techniques
Author: Eva Margui
Publisher: Momentum Press
Total Pages: 149
Release: 2013-01-25
Genre: Technology & Engineering
ISBN: 1606503936

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X-ray fluorescence spectrometry (XRF) is a well-established analytical technique for qualitative and quantitative elemental analysis of a wide variety of routine quality control and research samples. Among its many desirable features, it delivers true multi-element character analysis, acceptable speed and economy, easy of automation, and the capacity to analyze solid samples. This remarkable contribution to this field provides a comprehensive and up-to-date account of basic principles, recent developments, instrumentation, sample preparation procedures, and applications of XRF analysis. If you are a professional in materials science, analytic chemistry, or physics, you will benefit from not only the review of basics, but also the newly developed technologies with XRF. Those recent technological advances, including the design of low-power micro- focus tubes and novel X-ray optics and detectors, have made it possible to extend XRF to the analysis of low-Z elements and to obtain 2D or 3D information on a micrometer-scale. And, the recent development and commercialization of bench top and portable instrumentation, offering extreme simplicity of operation in a low-cost design, have extended the applications of XRF to many more analytical problems.

Total-Reflection X-Ray Fluorescence Analysis and Related Methods

Total-Reflection X-Ray Fluorescence Analysis and Related Methods
Author: Reinhold Klockenkämper
Publisher: John Wiley & Sons
Total Pages: 554
Release: 2015-01-27
Genre: Science
ISBN: 1118460278

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Explores the uses of TXRF in micro- and trace analysis, and in surface- and near-surface-layer analysis • Pinpoints new applications of TRXF in different fields of biology, biomonitoring, material and life sciences, medicine, toxicology, forensics, art history, and archaeometry • Updated and detailed sections on sample preparation taking into account nano- and picoliter techniques • Offers helpful tips on performing analyses, including sample preparations, and spectra recording and interpretation • Includes some 700 references for further study

Visualizing Chemistry

Visualizing Chemistry
Author: National Research Council
Publisher: National Academies Press
Total Pages: 222
Release: 2006-06-01
Genre: Science
ISBN: 030916463X

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Scientists and engineers have long relied on the power of imaging techniques to help see objects invisible to the naked eye, and thus, to advance scientific knowledge. These experts are constantly pushing the limits of technology in pursuit of chemical imagingâ€"the ability to visualize molecular structures and chemical composition in time and space as actual events unfoldâ€"from the smallest dimension of a biological system to the widest expanse of a distant galaxy. Chemical imaging has a variety of applications for almost every facet of our daily lives, ranging from medical diagnosis and treatment to the study and design of material properties in new products. In addition to highlighting advances in chemical imaging that could have the greatest impact on critical problems in science and technology, Visualizing Chemistry reviews the current state of chemical imaging technology, identifies promising future developments and their applications, and suggests a research and educational agenda to enable breakthrough improvements.

X-Ray Spectroscopy

X-Ray Spectroscopy
Author: Shatendra K Sharma
Publisher: BoD – Books on Demand
Total Pages: 294
Release: 2012-02-01
Genre: Technology & Engineering
ISBN: 9533079673

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The x-ray is the only invention that became a regular diagnostic tool in hospitals within a week of its first observation by Roentgen in 1895. Even today, x-rays are a great characterization tool at the hands of scientists working in almost every field, such as medicine, physics, material science, space science, chemistry, archeology, and metallurgy. With vast existing applications of x-rays, it is even more surprising that every day people are finding new applications of x-rays or refining the existing techniques. This book consists of selected chapters on the recent applications of x-ray spectroscopy that are of great interest to the scientists and engineers working in the fields of material science, physics, chemistry, astrophysics, astrochemistry, instrumentation, and techniques of x-ray based characterization. The chapters have been grouped into two major sections based upon the techniques and applications. The book covers some basic principles of satellite x-rays as characterization tools for chemical properties and the physics of detectors and x-ray spectrometer. The techniques like EDXRF, WDXRF, EPMA, satellites, micro-beam analysis, particle induced XRF, and matrix effects are discussed. The characterization of thin films and ceramic materials using x-rays is also covered.

Handbook of Practical X-Ray Fluorescence Analysis

Handbook of Practical X-Ray Fluorescence Analysis
Author: Burkhard Beckhoff
Publisher: Springer Science & Business Media
Total Pages: 897
Release: 2007-05-18
Genre: Science
ISBN: 3540367225

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X-Ray fluorescence analysis is an established technique for non-destructive elemental materials analysis. This book gives a user-oriented practical guidance to the application of this method. The book gives a survey of the theoretical fundamentals, analytical instrumentation, software for data processing, various excitation regimes including gracing incidents and microfocus measurements, quantitative analysis, applications in routine and micro analysis, mineralogy, biology, medicine, criminal investigations, archeology, metallurgy, abrasion, microelectronics, environmental air and water analysis. This book is the bible of X-Ray fluorescence analysis. It gives the basic knowledge on this technique, information on analytical equipment and guides the reader to the various applications. It appeals to researchers, analytically active engineers and advanced students.