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Author : W. Eberhardt
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (437 download)
Download or read book Resonant Inelastic Soft X-ray Scattering (RIXS) written by W. Eberhardt and published by . This book was released on 1997 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wolfgang Eberhardt
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (757 download)
Download or read book Special Issue Resonant Inelastic Soft X-ray Scattering (RIXS) written by Wolfgang Eberhardt and published by . This book was released on 1997 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wolfgang Eberhardt
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (757 download)
Download or read book Resonant Inelastic Soft X-ray Scattering (RIXS) written by Wolfgang Eberhardt and published by . This book was released on 1997 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Eberhard J. Jaeschke
Publisher : Springer
ISBN 13 : 9783319143934
Total Pages : 0 pages
Book Rating : 4.1/5 (439 download)
Download or read book Synchrotron Light Sources and Free-Electron Lasers written by Eberhard J. Jaeschke and published by Springer. This book was released on 2016-05-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardly any other discovery of the nineteenth century did have such an impact on science and technology as Wilhelm Conrad Röntgen’s seminal find of the X-rays. X-ray tubes soon made their way as excellent instruments for numerous applications in medicine, biology, materials science and testing, chemistry and public security. Developing new radiation sources with higher brilliance and much extended spectral range resulted in stunning developments like the electron synchrotron and electron storage ring and the freeelectron laser. This handbook highlights these developments in fifty chapters. The reader is given not only an inside view of exciting science areas but also of design concepts for the most advanced light sources. The theory of synchrotron radiation and of the freeelectron laser, design examples and the technology basis are presented. The handbook presents advanced concepts like seeding and harmonic generation, the booming field of Terahertz radiation sources and upcoming brilliant light sources driven by laser-plasma accelerators. The applications of the most advanced light sources and the advent of nanobeams and fully coherent x-rays allow experiments from which scientists in the past could not even dream. Examples are the diffraction with nanometer resolution, imaging with a full 3D reconstruction of the object from a diffraction pattern, measuring the disorder in liquids with high spatial and temporal resolution. The 20th century was dedicated to the development and improvement of synchrotron light sources with an ever ongoing increase of brilliance. With ultrahigh brilliance sources, the 21st century will be the century of x-ray lasers and their applications. Thus, we are already close to the dream of condensed matter and biophysics: imaging single (macro)molecules and measuring their dynamics on the femtosecond timescale to produce movies with atomic resolution.
Author : Sarah Hobbs
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book Development of Resonant Inelastic X-ray Scattering Spectroscopy written by Sarah Hobbs and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research focuses on the development of Resonant Inelastic X-ray Scattering spectroscopy (RIXS) as a tool in homogeneous catalysis by looking at 3d transition metal compounds and specifically Cr(salen) epoxidation catalysts. Previous studies have demonstrated the sensitivity of transition metal K-edge X-ray absorption pre-edge and edge features to their chemical environment, but the exact origins are unassigned. The aim of this study is to bring together a collection of complementary, and some novel, X-ray techniques to assign these features and obtain more detailed structural and electronic information on the systems under investigation. Novel high energy resolution data on transition metal complexes have been obtained and the pre-edge region has been simulated with the FEFF9 multiple scattering code. The increase in spectral structure compared to normal XANES allows for a more detailed analysis and as such, provides detailed insights in the electronic properties. L-edge XAS data obtained using soft X-rays enabled the determination of crystal field parameters, which were compared with other X-ray (RIXS) and optical absorption techniques. The novel RIXS experiments provide L and K-edge spectra unaffected by lifetime broadening or background from the main absorption edge. 2D images of X-ray emission as a function of absorption are obtained, revealing the relationship between them and providing direct and detailed information on the presence and position of molecular orbitals. These 1s2p RIXS experiments make use of hard X-rays enabling in-situ experiments, which are important in the field of catalysis, making it a promising tool to monitor the changing electronics of the metal centre as well as ligand coordination during the catalytic process. Whereas the electronic differences on the Cr metal as a function of salen ligand are not revealed by the current RIXS experiments, which is likely due to resolution issues, new preliminary insights in the different catalytic Cr intermediates of the epoxidation reaction have been obtained.
Download or read book Resonant Inelastic Soft X-ray Scattering of CdS written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Resonant inelastic x-ray scattering (RIXS) with soft x-rays is uniquely suited to study the elec-tronic structure of a variety of materials, but is currently limited by low (fluorescence yield) count rates. This limitation is overcome with a new high-transmission spectrometer that allows to measure soft x-ray RIXS"maps." The S L2,3 RIXS map of CdS is discussed and compared with density functional calculations. The map allows the extraction of decay channel-specific"absorp-tion spectra," giving detailed insight into the wave functions of occupied and unoccupied elec-tronic states.
Author : Ricardo Scherer
Publisher : GRIN Verlag
ISBN 13 : 3346005445
Total Pages : 139 pages
Book Rating : 4.3/5 (46 download)
Download or read book Soft X-ray emission and resonant inelastic scattering study of polycyclic hydrocarbons written by Ricardo Scherer and published by GRIN Verlag. This book was released on 2019-08-27 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2002 in the subject Physics - Experimental Physics, grade: 1, University of Cologne (2. Physikalisches Institut), language: English, abstract: This thesis comprises a detailed study of the electronic properties of the polycyclic hydrocarbons tetracene, perylene and coronene. The at room temperature grown organic layers consisted of a up to several hundred nanometer thickness, and have been studied with the experimental techniques soft x-ray emission spectroscopy (SXES) and NEXAFS-spectroscopy by means of synchrotron radiation. In particular, resonant inelastic scattering (RIXS) was employed in order to obtain possible band structure or MO-symmetry information of the studied systems. The studied materials consist of large organic molecules, evaporated under high vacuum on silicon wafers. The goal was to figure out, whether inside these organic layers the hydrocarbon molecules polymerize and form a band structure or if the hydrocarbon molecules do not interact with each other and retain their original molecular like symmetry and behavior. The discrete peaks in the hydrocarbon NEXAFS-spectra could be assigned by comparison with the literature to chemical shifted C1s→ π∗ transitions, caused by different chemical surrounded C-atoms. Hence, due to excitation on a certain π∗-resonance only C1s-electrons of equal C-atoms can be excited, which leads to a site selective excitation. The fluorescent decay of the created hole, which is as well localized on these former excited C-atoms was recorded energy dispersed in the SXE-spectrometer. This method is usually referred to as SXE. Therefore, the local MO-density was recorded. Hartree-Fock based ground state MO-calculations have been performed for each molecule, in order to simulate the SXE-spectra. Good agreement between experiment and simulation was shown, under the strict retainment of symmetry selection rules along the transitions. This result states, that the different hydrocarbon molecules conserve their symmetry and structure in an up to several hundred nanometer thick organic layer. Only in the region of the valence band maximum (π-states) weak indications for a band dispersion could be observed.
Author : Markus Hantschmann
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Stimulated Resonant Inelastic X-ray Scattering in Transition Metal Systems written by Markus Hantschmann and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the implementation of intense, short pulsed light sources throughout the last years, the powerful technique of resonant inelastic X-ray scattering (RIXS) became feasible for a wide range of experiments within femtosecond dynamics in correlated materials and molecules. In this thesis I investigate the potential to bring RIXS into the fluence regime of nonlinear X-ray-matter interactions, especially focusing on the impact of stimulated scattering on RIXS in transition metal systems in a transmission spectroscopy geometry around transition metal L-edges. After presenting the RIXS toolbox and the capabilities of free electron laser light sources for ultrafast intense X-ray experiments, the thesis explores an experiment designed to understand the impact of stimulated scattering on diffraction and direct beam transmission spectroscopy on a CoPd multilayer system. The experiments require short X-ray pulses that can only be generated at free electron lasers (FEL). Here the pulses are not only short, but also very intense, which opens ...
Author : Frank de Groot
Publisher : CRC Press
ISBN 13 : 1420008420
Total Pages : 512 pages
Book Rating : 4.4/5 (2 download)
Download or read book Core Level Spectroscopy of Solids written by Frank de Groot and published by CRC Press. This book was released on 2008-03-10 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Core level spectroscopy has become a powerful tool in the study of electronic states in solids. From fundamental aspects to the most recent developments, Core Level Spectroscopy of Solids presents the theoretical calculations, experimental data, and underlying physics of x-ray photoemission spectroscopy (XPS), x-ray absorption spectroscopy (XAS), x
Author : Li Lu
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.F/5 ( download)
Download or read book Resonant Inelastic X-ray Scattering Study of Two Lamellar Copper Oxides written by Li Lu and published by . This book was released on 2006 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xuan Gao
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (874 download)
Download or read book Development of Polarization Analysis System of Resonant Inelastic X-ray Scattering written by Xuan Gao and published by . This book was released on 2013 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resonant inelastic x-ray scattering is a powerful technique in condensed matter physics for studying the electronic excitations in novel materials of interest. In currently operating hard x-ray scattering instruments the energy and momentum transfers are measured while the outgoing polarization is not measured due to significant technical challenges. But the outgoing polarization of the scattered photons provides valuable information about the states involved in the scattering which is difficult to determine without polarization analysis. Polarization analysis has proved extremely valuable in soft x-ray scattering and so a polarization analysis system is being developed to fill the technical void at higher energies. A polarization analyzer is designed to reflect the scattered photons from the main analyzer by about 90 degrees. At this reflecting angle, the in-plane polarization is naturally eliminated by the polarization factor so that the scattered photons perpendicular to the reflection plane are fully obtained. Therefore it can separate the two orthogonal polarizations by rotating the system by 90 degrees. The research in this dissertation is about the development of an outgoing polarization analysis system complementing for the current RIXS instrument at Advanced Photon Source. The polarization analysis system developed includes the x-ray polarization analyzer and the mechanics attached to the RIXS spectrometers and for aligning the polarization analyzer. A variety of diffraction-based polarization analyzers are being developed for different x-ray absorption edges. A polarization analyzer for Cu K-edge has been developed, and one for the Ir L3-edge has also been developed. By separating the outgoing polarization, the strong polarization dependent electron excitations, e.g. the spin-orbital excitations in iridates can be measured by the polarization analysis system. Further, the system enables us to separate and study the transverse and longitudinal magnons in Sr2IrO4, demonstrating a new capability for the RIXS technique.
Author : Andrey Geondzhian
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)
Download or read book Resonant Inelastic X-ray Scattering as a Probe of Exciton-phonon Coupling written by Andrey Geondzhian and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phonons contribute to resonant inelastic X-ray scattering (RIXS) as a consequence of the coupling between electronic and lattice degrees of freedom. Unlike other techniques that are sensitive to electron-phonon interactions, RIXS can give access to momentum dependent coupling constants. Information about the dispersion of the electron-phonon interaction is highly desirable in the context of understanding anisotropic conventional and unconventional superconductivity.We considered the phonon contribution to RIXS from the theoretical point of view. In contrast to previous studies, we emphasize the role of the core-hole lattice coupling. Our model, with parameters obtained from first principles, shows that even in the case of a deep core-hole, RIXS probes exciton-phonon coupling rather than a direct electron-phonon coupling.This difference leads to quantitative and qualitative deviations from the interpretation of the implied electron-phonon coupling from the standard view expressed in the literature. Thus, our objective is to develop a rigorous approach to quantify electron-phonon coupling within the context of RIXS measurements. The ability to accurately reproduce experimental results from first-principles calculations, without recourse to adjustable parameters, should be viewed as the ultimate test of a proper understanding of the phonon contribution to RIXS.We start by considering only the core-hole--phonon interaction within the context of X-ray photoemission spectroscopy. We combine an ab initio calculation of the real-space response function with many-body Green's functions techniques to reproduce the vibrational side-bands in SiX4 (X=H, F) molecules. The approach we developed is suitable for application to crystalline materials.We next consider the phonon contribution to X-ray absorption spectra. Unlike the charged excitations generated by X-ray photoemission, X-ray absorption creates a neutral excitation that we approximate as a core-hole and an excited electron. We first solved the electronic part of the problem on the level of the Bethe-Salpeter equation and then dressed the resulting 2-particle excitonic quasiparticle with the exciton-phonon interactions using the cumulant ansatz. The viability of this methodology was tested by calculating the N K-edge XAS of the N2 molecule and the O K-edge of acetone. The resulting vibronic spectra agreed favorably with experimental results.Finally, we construct a hybrid formulation of the RIXS cross section that preserves explicit summation over a small number of final states, but replaces the summation over intermediate states, which might be enormously expensive, with a Green's function. We develop an expansion of the Green's function and derive both analytically exact (in the no-recoil limit) and approximate solutions. The formalism was again tested on the O K-edge of acetone and agrees well with the experiment. To provide an outlook towards future work, we discuss application of the developed formalism to crystalline materials.
Author : Michel van Veenendaal
Publisher : Cambridge University Press
ISBN 13 : 1316239861
Total Pages : 247 pages
Book Rating : 4.3/5 (162 download)
Download or read book Theory of Inelastic Scattering and Absorption of X-rays written by Michel van Veenendaal and published by Cambridge University Press. This book was released on 2015-01-26 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive, self-contained guide to X-ray spectroscopy will equip you with everything you need to begin extracting the maximum amount of information available from X-ray spectra. Key topics such as the interaction between X-rays and matter, the basic theory of spectroscopy, and selection and sum rules, are introduced from the ground up, providing a solid theoretical grounding. The book also introduces core underlying concepts such as atomic structure, solid-state effects, the fundamentals of tensor algebra and group theory, many-body interactions, scattering theory, and response functions, placing spectroscopy within a broader conceptual framework, and encouraging a deep understanding of this essential theoretical background. Suitable for graduate students, researchers, materials scientists and optical engineers, this is the definitive guide to the theory behind this powerful and widely used technique.
Download or read book Theoretical Approach to Resonant Inelastic X-ray Scattering in Iron-based Superconductors at the Energy Scale of the Superconducting Gap written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, we develop a phenomenological theory to predict the characteristic features of the momentumdependent scattering amplitude in resonant inelastic x-ray scattering (RIXS) at the energy scale of the superconducting gap in iron-based super-conductors. Taking into account all relevant orbital states as well as their specific content along the Fermi surface we evaluate the charge and spin dynamical structure factors for the compounds LaOFeAs and LiFeAs, based on tight-binding models which are fully consistent with recent angle-resolved photoemission spectroscopy (ARPES) data. We find a characteristic intensity redistribution between charge and spin dynamical structure factors which discriminates between sign-reversing and sign-preserving quasiparticle excitations. Consequently, our results show that RIXS spectra can distinguish between s± and s++ wave gap functions in the singlet pairing case. In addition, we find that an analogous intensity redistribution at small momenta can reveal the presence of a chiral p-wave triplet pairing.
Author : Claudia Cancellieri
Publisher : Springer
ISBN 13 : 3319749897
Total Pages : 326 pages
Book Rating : 4.3/5 (197 download)
Download or read book Spectroscopy of Complex Oxide Interfaces written by Claudia Cancellieri and published by Springer. This book was released on 2018-04-09 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the most recent and compelling experimental results for complex oxide interfaces. The results of this book were obtained with the cutting-edge photoemission technique at highest energy resolution. Due to their fascinating properties for new-generation electronic devices and the challenge of investigating buried regions, the book chiefly focuses on complex oxide interfaces. The crucial feature of exploring buried interfaces is the use of soft X-ray angle-resolved photoemission spectroscopy (ARPES) operating on the energy range of a few hundred eV to increase the photoelectron mean free path, enabling the photons to penetrate through the top layers – in contrast to conventional ultraviolet (UV)-ARPES techniques. The results presented here, achieved by different research groups around the world, are summarized in a clearly structured way and discussed in comparison with other photoemission spectroscopy techniques and other oxide materials. They are complemented and supported by the most recent theoretical calculations as well as results of complementary experimental techniques including electron transport and inelastic resonant X-ray scattering.
Author : Haiyu Lu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (124 download)
Download or read book Investigation of Condensed Matter Systems with Resonant Inelastic X-ray Scattering written by Haiyu Lu and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the key ideas in the condensed matter physics at a low energy scale is to treat an interacting many-body electron system in terms of weakly interacting emergent particles, namely elementary excitations. Resonant inelastic X-ray scattering (RIXS) has emerged as a powerful tool to study elementary excitations, thanks to the exciting instrumentation improvement and the advent of X-ray synchrotron radiation facilities. By tuning the incident X-ray photon energy to the resonance condition of a specific element, RIXS can resonantly enhance the scattering cross section between the incident photon and the elementary excitation in the material, enabling element-specific measurements. In this dissertation, we investigated magnetic excitations in the recently discovered superconducting infinite-layer nickelate thin films. Besides a similar crystal structure, the infinite-layer nickelate is nominally isoelectronic to the high temperature cuprate superconductors. At this early stage, it is important to experimentally study the similarities and differences between cuprates and nickelates, particularly the respective electronic and magnetic structures. Here, by utilizing the high-resolution RIXS, we found that the parent compound of the infinite-layer nickelate is not a charge-transfer material, like cuprates. Instead, it is probably closer to a Mott compound with an additional coupling with rare-earth metallic states. Furthermore, we also found a branch of dispersive magnetic excitations with a bandwidth of approximately 200 meV in the parent compound nickelates. Although these modes are significantly damped, they are reminiscent of the spin-wave of strongly coupled, anti-ferromagnetically aligned spins on a square lattice. Upon doping, the spectral weight and energy decrease slightly, while the modes become overdamped. The dispersion, doping dependence, damping effect of the magnetic excitation, and the added complexity due to the presence of the rare-earth metallic pockets, together with its comparison with the magnetic excitation in cuprates, will be discussed.
Author : Robert D. Cowan
Publisher : Univ of California Press
ISBN 13 : 0520906152
Total Pages : 752 pages
Book Rating : 4.5/5 (29 download)
Download or read book The Theory of Atomic Structure and Spectra written by Robert D. Cowan and published by Univ of California Press. This book was released on 2023-11-15 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both the interpretation of atomic spectra and the application of atomic spectroscopy to current problems in astrophysics, laser physics, and thermonuclear plasmas require a thorough knowledge of the Slater-Condon theory of atomic structure and spectra. This book gathers together aspects of the theory that are widely scattered in the literature and augments them to produce a coherent set of closed-form equations suitable both for computer calculations on cases of arbitrary complexity and for hand calculations for very simple cases.
