Far And Deep Ultraviolet Spectroscopy

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Far- and Deep-Ultraviolet Spectroscopy

Author : Yukihiro Ozaki
Publisher : Springer
ISBN 13 : 4431555498
Total Pages : 181 pages
Book Rating : 4.4/5 (315 download)

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Book Synopsis Far- and Deep-Ultraviolet Spectroscopy by : Yukihiro Ozaki

Download or read book Far- and Deep-Ultraviolet Spectroscopy written by Yukihiro Ozaki and published by Springer. This book was released on 2015-06-26 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first comprehensive work to be published on far-ultraviolet (FUV) and deep-ultraviolet (DUV) spectroscopy, subjects of keen interest because new areas of spectroscopy have been born in the FUV and DUV regions. For example, FUV spectroscopy in condensed matter has become possible due to the development of attenuated total reflection/FUV spectroscopy. As other examples, DUV surface-enhanced Raman scattering and DUV tip-enhanced Raman scattering have received great attention. Imaging by DUV spectroscopy has also become an area of interest. More recently, FUV and DUV spectroscopy have shown potential for applications in several fields including industry. All these topics are described in this book. Doctoral students and researchers in universities and national research institutes as well as researchers in various industries will find this volume highly useful.

Spectroscopic Techniques for Polymer Characterization

Author : Yukihiro Ozaki
Publisher : John Wiley & Sons
ISBN 13 : 3527830324
Total Pages : 500 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis Spectroscopic Techniques for Polymer Characterization by : Yukihiro Ozaki

Download or read book Spectroscopic Techniques for Polymer Characterization written by Yukihiro Ozaki and published by John Wiley & Sons. This book was released on 2021-10-29 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: An insightful exploration of cutting-edge spectroscopic techniques in polymer characterization In Spectroscopic Techniques for Polymer Characterization: Methods, Instrumentation, Applications, a team of distinguished chemists delivers a comprehensive exploration of the vast potential of spectroscopic characterization techniques in polymer research. The book offers a concise outline of the principles, advantages, instrumentation, experimental techniques, and noteworthy applications of cutting-edge spectroscopy. Covering a wide range of polymers, from nylon to complex polymeric nanocomposites, the author presents recent developments in polymer science to polymer, analytical, and material chemists, assisting them in keeping track of the progress in modern spectroscopy. Spectroscopic Techniques for Polymer Characterization contains contributions from pioneers in modern spectroscopic techniques from around the world. The included materials bridge the gap between spectroscopists, polymer scientists, and engineers in academia and industry. The book also offers: A thorough introduction to the progress in spectroscopic techniques, including polymer spectroscopy and near-infrared spectroscopy Comprehensive explorations of topical polymers studied by spectroscopy, including polymer thin films, fluoropolymers, polymer solutions, conductive polymers Practical discussions of infrared imaging, near-infrared imaging, two-dimensional correlation spectroscopy, and far-ultraviolet spectroscopy In-depth examinations of spectroscopic studies of weak hydrogen bonding in polymers Spectroscopic Techniques for Polymer Characterization: Methods, Instrumentation, Applications is a must-read reference for polymer, analytical, and physical chemists, as well as materials scientists and spectroscopists seeking a one-stop resource for polymer characterization using spectroscopic analyses.

Frontiers and Advances in Molecular Spectroscopy

Author : Jaan Laane
Publisher : Elsevier
ISBN 13 : 0128112212
Total Pages : 788 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Frontiers and Advances in Molecular Spectroscopy by : Jaan Laane

Download or read book Frontiers and Advances in Molecular Spectroscopy written by Jaan Laane and published by Elsevier. This book was released on 2017-11-13 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frontiers and Advances in Molecular Spectroscopy once again brings together the most eminent scientists from around the world to describe their work at the cutting-edge of molecular spectroscopy. Much of what we know about atoms, molecules and the nature of matter has been obtained using spectroscopy over the last one hundred years or so. Going far beyond the topics discussed in Jaan Laane's earlier book on the subject, these chapters describe new methodologies and applications, instrumental developments and theory, which are taking spectroscopy into still new frontiers. The robust range of topics once again demonstrates the wide utility of spectroscopic techniques. New topics include ultrafast spectroscopy of the transition state, SERS/far-uv spectroscopy, femtosecond coherent anti-Stokes Raman spectroscopy, high-resolution laser induced fluorescence spectroscopy, Raman spectroscopy and biosensors, vibrational optical activity, ultrafast two-dimensional spectroscopy, biology with x-ray lasers, isomerization dynamics and hydrogen bonding, single molecule imaging, spectra of intermediates, matrix isolation spectroscopy and more. - Covers spectroscopic investigations on the cutting edge of science - Written and edited by leading experts in their respective fields - Allows researchers to access a broad range of essential modern spectroscopy content from a single source rather than wading through hundreds of scattered journal articles

Spectroscopy and Computation of Hydrogen-BondedSystems

Author : Marek J. Wójcik
Publisher : John Wiley & Sons
ISBN 13 : 3527349723
Total Pages : 548 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Spectroscopy and Computation of Hydrogen-BondedSystems by : Marek J. Wójcik

Download or read book Spectroscopy and Computation of Hydrogen-BondedSystems written by Marek J. Wójcik and published by John Wiley & Sons. This book was released on 2023-03-27 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive spectroscopic view of the state-of the-art in theoretical and experimental hydrogen bonding research Spectroscopy and Computation of Hydrogen-Bonded Systems includes diverse research efforts spanning the frontiers of hydrogen bonding as revealed through state-of-the-art spectroscopic and computational methods, covering a broad range of experimental and theoretical methodologies used to investigate and understand hydrogen bonding. The work explores the key quantitative relationships between fundamental vibrational frequencies and hydrogen-bond length/strength and provides an extensive reference for the advancement of scientific knowledge on hydrogen-bonded systems. Theoretical models of vibrational landscapes in hydrogen-bonded systems, as well as kindred studies designed to interpret intricate spectral features in gaseous complexes, liquids, crystals, ices, polymers, and nanocomposites, serve to elucidate the provenance of spectroscopic findings. Results of experimental and theoretical studies on multidimensional proton transfer are also presented. Edited by two highly qualified researchers in the field, sample topics covered in Spectroscopy and Computation of Hydrogen-Bonded Systems include: Quantum-mechanical treatments of tunneling-mediated pathways in enzyme catalysis and molecular-dynamics simulations of structure and dynamics in hydrogen-bonded systems Mechanisms of multiple proton-transfer pathways in hydrogen-bonded clusters and modern spectroscopic tools with synergistic quantum-chemical analyses Mechanistic investigations of deuterium kinetic isotope effects, ab initio path integral methods, and molecular-dynamics simulations Key relationships that exist between fundamental vibrational frequencies and hydrogen-bond length/strength Analogous spectroscopic and semi-empirical computational techniques examining larger hydrogen-bonded systems Reflecting the polymorphic nature of hydrogen bonding and bringing together the latest experimental and computational work in the field, Spectroscopy and Computation of Hydrogen-Bonded Systems is an essential resource for chemists and other scientists involved in projects or research that intersects with the topics covered within.

Molecular and Laser Spectroscopy

Author : V.P. Gupta
Publisher : Elsevier
ISBN 13 : 0128188715
Total Pages : 706 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Molecular and Laser Spectroscopy by : V.P. Gupta

Download or read book Molecular and Laser Spectroscopy written by V.P. Gupta and published by Elsevier. This book was released on 2020-07-10 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular and Laser Spectroscopy, Advances and Applications: Volume 2 gives students and researchers an up-to-date understanding of the fast-developing area of molecular and laser spectroscopy. This book covers basic principles and advances in several conventional as well as new and upcoming areas of molecular and laser spectroscopy, such as a wide range of applications in medical science, material science, standoff detection, defence and security, chemicals and pharmaceuticals, and environmental science. It covers the latest advancements, both in terms of techniques and applications, and highlights future projections. Editors V.P. Gupta and Yukihiro Ozaki have brought together eminent scientists in different areas of spectroscopy to develop specialized topics in conventional molecular spectroscopy (Cavity ringdown, Matrix Isolation, Intense THz, Far- and Deep- UV, Optogalvanic ), linear and nonlinear laser spectroscopy (Rayleigh & Raman Scattering), Ultrafast Time-resolved spectroscopy, and medical applications of molecular spectroscopy. and advanced material found in research articles. This new volume expands upon the topics covered in the first volume for scientists to learn the latest techniques and put them to practical use in their work. - Covers several areas of spectroscopy research and expands upon topics covered in the first volume - Includes exhaustive lists of research articles, reviews, and books at the end of each chapter to further learning objectives - Uses illustrative examples of the varied applications to provide a practical guide to those interested in using molecular and laser spectroscopy tools in their research

Molecular Spectroscopy

Author : Yukihiro Ozaki
Publisher : John Wiley & Sons
ISBN 13 : 3527814620
Total Pages : 636 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis Molecular Spectroscopy by : Yukihiro Ozaki

Download or read book Molecular Spectroscopy written by Yukihiro Ozaki and published by John Wiley & Sons. This book was released on 2019-04-23 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uniquely creates a strong bridge between molecular spectroscopy and quantum chemistry This two-volume book consists of many reviews reporting new applications of quantum chemistry to molecular spectroscopy (Raman, infrared, near-infrared, terahertz, far-ultraviolet, etc.). It contains brief introductions to quantum chemistry for spectroscopists, and to the recent progress on molecular spectroscopy for quantum chemists. Molecular Spectroscopy: A Quantum Chemistry Approach examines the recent progress made in the field of molecular spectroscopy; the state of the art of quantum chemistry for molecular spectroscopy; and more. It offers multiple chapters covering the application of quantum chemistry to: visible absorption and fluorescence, Raman spectroscopy, infrared spectroscopy, near-infrared spectroscopy, terahertz spectroscopy, and far-ultraviolet spectroscopy. It presents readers with hydrogen bonding studies by vibrational spectroscopy and quantum chemistry, as well as vibrational spectroscopy and quantum chemistry studies on both biological systems and nano science. The book also looks at vibrational anharmonicity and overtones, and nonlinear and time-resolved spectroscopy. -Comprehensively covers existing and recent applications of quantum chemistry to molecular spectroscopy -Introduces the quantum chemistry for the field of spectroscopy and the advancements being made on molecular spectroscopy for quantum chemistry -Edited by world leading experts who have long standing, extensive experience and international standing in the field Molecular Spectroscopy: A Quantum Chemistry Approach is an ideal book for analytical chemists, theoretical chemists, chemists, biochemists, materials scientists, biologists, and physicists interested in the subject.

Molecular Spectroscopy, 2 Volume Set

Author : Yukihiro Ozaki
Publisher : John Wiley & Sons
ISBN 13 : 3527344616
Total Pages : 636 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Molecular Spectroscopy, 2 Volume Set by : Yukihiro Ozaki

Download or read book Molecular Spectroscopy, 2 Volume Set written by Yukihiro Ozaki and published by John Wiley & Sons. This book was released on 2019-09-03 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uniquely creates a strong bridge between molecular spectroscopy and quantum chemistry This two-volume book consists of many reviews reporting new applications of quantum chemistry to molecular spectroscopy (Raman, infrared, near-infrared, terahertz, far-ultraviolet, etc.). It contains brief introductions to quantum chemistry for spectroscopists, and to the recent progress on molecular spectroscopy for quantum chemists. Molecular Spectroscopy: A Quantum Chemistry Approach examines the recent progress made in the field of molecular spectroscopy; the state of the art of quantum chemistry for molecular spectroscopy; and more. It offers multiple chapters covering the application of quantum chemistry to: visible absorption and fluorescence, Raman spectroscopy, infrared spectroscopy, near-infrared spectroscopy, terahertz spectroscopy, and far-ultraviolet spectroscopy. It presents readers with hydrogen bonding studies by vibrational spectroscopy and quantum chemistry, as well as vibrational spectroscopy and quantum chemistry studies on both biological systems and nano science. The book also looks at vibrational anharmonicity and overtones, and nonlinear and time-resolved spectroscopy. -Comprehensively covers existing and recent applications of quantum chemistry to molecular spectroscopy -Introduces the quantum chemistry for the field of spectroscopy and the advancements being made on molecular spectroscopy for quantum chemistry -Edited by world leading experts who have long standing, extensive experience and international standing in the field Molecular Spectroscopy: A Quantum Chemistry Approach is an ideal book for analytical chemists, theoretical chemists, chemists, biochemists, materials scientists, biologists, and physicists interested in the subject.

UV and X-Ray Spectroscopy of Laboratory and Astrophysical Plasmas

Author : Eric H. Silver
Publisher : Cambridge University Press
ISBN 13 : 9780521548168
Total Pages : 636 pages
Book Rating : 4.5/5 (481 download)

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Book Synopsis UV and X-Ray Spectroscopy of Laboratory and Astrophysical Plasmas by : Eric H. Silver

Download or read book UV and X-Ray Spectroscopy of Laboratory and Astrophysical Plasmas written by Eric H. Silver and published by Cambridge University Press. This book was released on 2004-01-29 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: Up-to-date accounts of recent and future advances in short-wavelength spectroscopy of laboratory and cosmic plasmas.

UV-Visible Reflection Spectroscopy of Liquids

Author : Jukka A. Räty
Publisher : Springer
ISBN 13 : 3540450939
Total Pages : 220 pages
Book Rating : 4.5/5 (44 download)

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Book Synopsis UV-Visible Reflection Spectroscopy of Liquids by : Jukka A. Räty

Download or read book UV-Visible Reflection Spectroscopy of Liquids written by Jukka A. Räty and published by Springer. This book was released on 2013-03-20 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date overview of reflectometers used for optical spectroscopy of various kinds of liquids, ranging from well-known transparent liquids to "pathological" industrial liquids. The book reviews and explains basic materials for anyone wanting to get to know the theory, spectral analysis and modern devices needed for the measurement of refractive index and absorption of liquids. Moreover, the book gives an introduction to reflectivity from optically nonlinear liquids such as liquids containing nanoparticles.

Far-ultraviolet Spectroscopy

Author : Frances L. Sachs
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Far-ultraviolet Spectroscopy by : Frances L. Sachs

Download or read book Far-ultraviolet Spectroscopy written by Frances L. Sachs and published by . This book was released on 1952 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Far- and Deep-Ultraviolet Spectroscopy

Author : Yukihiro Ozaki
Publisher :
ISBN 13 : 9784431555506
Total Pages : pages
Book Rating : 4.5/5 (555 download)

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Book Synopsis Far- and Deep-Ultraviolet Spectroscopy by : Yukihiro Ozaki

Download or read book Far- and Deep-Ultraviolet Spectroscopy written by Yukihiro Ozaki and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first comprehensive work to be published on far-ultraviolet (FUV) and deep-ultraviolet (DUV) spectroscopy, subjects of keen interest because new areas of spectroscopy have been born in the FUV and DUV regions. For example, FUV spectroscopy in condensed matter has become possible due to the development of attenuated total reflection/FUV spectroscopy. As other examples, DUV surface-enhanced Raman scattering and DUV tip-enhanced Raman scattering have received great attention. Imaging by DUV spectroscopy has also become an area of interest. More recently, FUV and DUV spectroscopy have shown potential for applications in several fields including industry. All these topics are described in this book. Doctoral students and researchers in universities and national research institutes as well as researchers in various industries will find this volume highly useful.

Recent Developments In Plasmon-supported Raman Spectroscopy: 45 Years Of Enhanced Raman Signals

Author : Katrin Kneipp
Publisher : World Scientific
ISBN 13 : 1786344254
Total Pages : 513 pages
Book Rating : 4.7/5 (863 download)

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Book Synopsis Recent Developments In Plasmon-supported Raman Spectroscopy: 45 Years Of Enhanced Raman Signals by : Katrin Kneipp

Download or read book Recent Developments In Plasmon-supported Raman Spectroscopy: 45 Years Of Enhanced Raman Signals written by Katrin Kneipp and published by World Scientific. This book was released on 2017-12-12 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface enhanced Raman scattering (SERS) might be one of the most impressive effects to demonstrate the power of plasmonic approaches in spectroscopy and became one of the 'triggers' for the rapidly emerging field of plasmonics.This book provides a review of some recent developments in SERS, such as tip enhanced Raman scattering (TERS), reports new experimental observations, sophisticated new SERS-active structures and substrates, new theoretical insight to explain the effect as well as exciting applications in various fields such as analytical science, biomedicine and nanotechnology.Written for graduate students and established researchers looking for inspiration for future work, its interdisciplinary nature makes the book suitable for readers in the fields of chemistry, physics, biology, medicine, nanotechnology and materials science.

Encyclopedia of Spectroscopy and Spectrometry

Author :
Publisher : Academic Press
ISBN 13 : 0128032251
Total Pages : 3716 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Encyclopedia of Spectroscopy and Spectrometry by :

Download or read book Encyclopedia of Spectroscopy and Spectrometry written by and published by Academic Press. This book was released on 2016-09-22 with total page 3716 pages. Available in PDF, EPUB and Kindle. Book excerpt: This third edition of the Encyclopedia of Spectroscopy and Spectrometry, Three Volume Set provides authoritative and comprehensive coverage of all aspects of spectroscopy and closely related subjects that use the same fundamental principles, including mass spectrometry, imaging techniques and applications. It includes the history, theoretical background, details of instrumentation and technology, and current applications of the key areas of spectroscopy. The new edition will include over 80 new articles across the field. These will complement those from the previous edition, which have been brought up-to-date to reflect the latest trends in the field. Coverage in the third edition includes: Atomic spectroscopy Electronic spectroscopy Fundamentals in spectroscopy High-Energy spectroscopy Magnetic resonance Mass spectrometry Spatially-resolved spectroscopic analysis Vibrational, rotational and Raman spectroscopies The new edition is aimed at professional scientists seeking to familiarize themselves with particular topics quickly and easily. This major reference work continues to be clear and accessible and focus on the fundamental principles, techniques and applications of spectroscopy and spectrometry. Incorporates more than 150 color figures, 5,000 references, and 300 articles for a thorough examination of the field Highlights new research and promotes innovation in applied areas ranging from food science and forensics to biomedicine and health Presents a one-stop resource for quick access to answers and an in-depth examination of topics in the spectroscopy and spectrometry arenas

Spectroscopic Techniques for Polymer Characterization

Author : Yukihiro Ozaki
Publisher : John Wiley & Sons
ISBN 13 : 3527348336
Total Pages : 500 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Spectroscopic Techniques for Polymer Characterization by : Yukihiro Ozaki

Download or read book Spectroscopic Techniques for Polymer Characterization written by Yukihiro Ozaki and published by John Wiley & Sons. This book was released on 2022-03-14 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: An insightful exploration of cutting-edge spectroscopic techniques in polymer characterization In Spectroscopic Techniques for Polymer Characterization: Methods, Instrumentation, Applications, a team of distinguished chemists delivers a comprehensive exploration of the vast potential of spectroscopic characterization techniques in polymer research. The book offers a concise outline of the principles, advantages, instrumentation, experimental techniques, and noteworthy applications of cutting-edge spectroscopy. Covering a wide range of polymers, from nylon to complex polymeric nanocomposites, the author presents recent developments in polymer science to polymer, analytical, and material chemists, assisting them in keeping track of the progress in modern spectroscopy. Spectroscopic Techniques for Polymer Characterization contains contributions from pioneers in modern spectroscopic techniques from around the world. The included materials bridge the gap between spectroscopists, polymer scientists, and engineers in academia and industry. The book also offers: A thorough introduction to the progress in spectroscopic techniques, including polymer spectroscopy and near-infrared spectroscopy Comprehensive explorations of topical polymers studied by spectroscopy, including polymer thin films, fluoropolymers, polymer solutions, conductive polymers Practical discussions of infrared imaging, near-infrared imaging, two-dimensional correlation spectroscopy, and far-ultraviolet spectroscopy In-depth examinations of spectroscopic studies of weak hydrogen bonding in polymers Spectroscopic Techniques for Polymer Characterization: Methods, Instrumentation, Applications is a must-read reference for polymer, analytical, and physical chemists, as well as materials scientists and spectroscopists seeking a one-stop resource for polymer characterization using spectroscopic analyses.

Extreme Ultraviolet Astronomy

Author : Martin A. Barstow
Publisher : Cambridge University Press
ISBN 13 : 1139435124
Total Pages : 412 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Extreme Ultraviolet Astronomy by : Martin A. Barstow

Download or read book Extreme Ultraviolet Astronomy written by Martin A. Barstow and published by Cambridge University Press. This book was released on 2003-03-13 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the development of astronomy in the Extreme Ultraviolet wavelength range, from the first rocket-based experiments to later satellite missions. It will be of great value to graduate students and researchers.

Mining the Sky

Author : A.J. Banday
Publisher : Springer Science & Business Media
ISBN 13 : 9783540424680
Total Pages : 732 pages
Book Rating : 4.4/5 (246 download)

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Book Synopsis Mining the Sky by : A.J. Banday

Download or read book Mining the Sky written by A.J. Banday and published by Springer Science & Business Media. This book was released on 2001-09-11 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book reviews methods for the analysis of astronomical datasets, particularly emphasizing very large databases arising from both existing and forthcoming projects, as well as current large-scale computer simulation studies. Leading experts give overviews of cutting-edge methods applicable in the area of astronomical data mining.

Frontiers Of Space And Ground-Based Astronomy

Author : Willem Wamsteker
Publisher : Springer Science & Business Media
ISBN 13 : 9780792325277
Total Pages : 794 pages
Book Rating : 4.3/5 (252 download)

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Book Synopsis Frontiers Of Space And Ground-Based Astronomy by : Willem Wamsteker

Download or read book Frontiers Of Space And Ground-Based Astronomy written by Willem Wamsteker and published by Springer Science & Business Media. This book was released on 1994-08-31 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: ROSAT Observations G. HASINGER Max-Planck-Institut flir extraterrestrische Physik, D-85740 Garching, Germany Abstract. This review describes the most recent advances in the study of the extragalactic soft X-ray background and what we can learn about its constituents. The deepest pointed observations with the ROSAT PSPC are discussed. The logN-logS relation is presented, which reaches to the faintest X-ray fluxes and to the highest AGN surface densities ever achieved. The N(>S) relation shows a 2 density in excess of 400 deg- at the faintest fluxes and a flattening below the Einstein Deep Survey limit. About 60% of the extragalactic background has been resolved in the deepest field. Detailed source spectra and first optical and radio identifications will be discussed. The results are put into perspective of the higher energy X -ray background. Key words: X-rays, background radiations, active galactic nuclei. 1. Introduction The extragalactic X-ray background (XRB), discovered about 30 years ago, has been studied extensively with many X-ray experiments, in particular with the satel lites HEAO I and II (see ego Boldt 1987) and with ROSAT (e. g. Hasinger et aI. , 1993). Figure 1 shows a compilation of some of the most recent spectral measure ments for the X-ray background. Over the energy range from 3 to about 100 keY its spectrum can be well approximated by an optically thin thermal bremsstrahlung model with kT ~ 40 keY, while at lower X-ray energies a steepening into a new component has been observed observed (e. g.