Devon R. Mortensen

Bio: Devon R. Mortensen is an academic researcher from University of Washington. The author has contributed to research in topics: XANES & Emission spectrum. The author has an hindex of 10, co-authored 17 publications receiving 369 citations.

A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements

Abstract: We report the development of a laboratory-based Rowland-circle monochromator that incorporates a low power x-ray (bremsstrahlung) tube source, a spherically bent crystal analyzer, and an energy-resolving solid-state detector. This relatively inexpensive, introductory level instrument achieves 1-eV energy resolution for photon energies of ∼5 keV to ∼10 keV while also demonstrating a net efficiency previously seen only in laboratory monochromators having much coarser energy resolution. Despite the use of only a compact, air-cooled 10 W x-ray tube, we find count rates for nonresonant x-ray emission spectroscopy comparable to those achieved at monochromatized spectroscopy beamlines at synchrotron light sources. For x-ray absorption near edge structure, the monochromatized flux is small (due to the use of a low-powered x-ray generator) but still useful for routine transmission-mode studies of concentrated samples. These results indicate that upgrading to a standard commercial high-power line-focused x-ray tube or rotating anode x-ray generator would result in monochromatized fluxes of order 106–107 photons/s with no loss in energy resolution. This work establishes core technical capabilities for a rejuvenation of laboratory-based hard x-ray spectroscopies that could have special relevance for contemporary research on catalytic or electrical energy storage systems using transition-metal, lanthanide, or noble-metal active species.

An improved laboratory-based x-ray absorption fine structure and x-ray emission spectrometer for analytical applications in materials chemistry research

Abstract: X-ray absorption fine structure (XAFS) and x-ray emission spectroscopy (XES) are advanced x-ray spectroscopies that impact a wide range of disciplines. However, unlike the majority of other spectroscopic methods, XAFS and XES are accompanied by an unusual access model, wherein the dominant use of the technique is for premier research studies at world-class facilities, i.e., synchrotron x-ray light sources. In this paper, we report the design and performance of an improved XAFS and XES spectrometer based on the general conceptual design of Seidler et al. [Rev. Sci. Instrum. 85, 113906 (2014)]. New developments include reduced mechanical degrees of freedom, much-increased flux, and a wider Bragg angle range to enable extended x-ray absorption fine structure (EXAFS) measurement and analysis for the first time with this type of modern laboratory XAFS configuration. This instrument enables a new class of routine applications that are incompatible with the mission and access model of the synchrotron light sources. To illustrate this, we provide numerous examples of x-ray absorption near edge structure (XANES), EXAFS, and XES results for a variety of problems and energy ranges. Highlights include XAFS and XES measurements of battery electrode materials, EXAFS of Ni with full modeling of results to validate monochromator performance, valence-to-core XES for 3d transition metal compounds, and uranium XANES and XES for different oxidation states. Taken en masse, these results further support the growing perspective that modern laboratory-based XAFS and XES have the potential to develop a new branch of analytical chemistry.

An Improved Laboratory-Based XAFS and XES Spectrometer for Analytical Applications in Materials Chemistry Research

Abstract: X-ray absorption fine structure (XAFS) and x-ray emission spectroscopy (XES) are advanced x-ray spectroscopies that impact a wide range of disciplines. However, unlike the majority of other spectroscopic methods, XAFS and XES are accompanied by an unusual access model, wherein; the dominant use of the technique is for premier research studies at world-class facilities, i.e., synchrotron x-ray light sources. In this paper we report the design and performance of an improved spectrometer XAFS and XES based on the general conceptual design of Seidler, et al., Rev. Sci. Instrum. 2014. New developments include reduced mechanical degrees of freedom, much-increased flux, and a wider Bragg angle range to enable extended x-ray absorption fine structure (EXAFS) for the first time with this type of modern laboratory XAFS configuration. This instrument enables a new class of routine applications that are incompatible with the mission and access model of the synchrotron light sources. To illustrate this, we provide numerous examples of x-ray absorption near edge structure (XANES), EXAFS, and XES results for a variety of problems and energy ranges. Highlights include XAFS and XES measurements of battery electrode materials, EXAFS of Ni and V with full modeling of results to validate monochromator performance, valence-to-core XES for 3d transition metal compounds, and uranium XANES and XES for different oxidation states. Taken en masse, these results further support the growing perspective that modern laboratory-based XAFS and XES have the potential to develop a new branch of analytical chemistry.

Benchmark results and theoretical treatments for valence-to-core x-ray emission spectroscopy in transition metal compounds

Abstract: We report measurement of the valence-to-core (VTC) region of the K-shell x-ray emission spectra from several Zn and Fe inorganic compounds, and their critical comparison with three existing theoretical treatments. We find generally good agreement between the respective theories and experiment and in particular find an important admixture of dipole and quadrupole character for Zn materials that is much weaker in Fe-based systems. These results on materials whose simple crystal structures should not, a priori, pose deep challenges to theory, will prove useful in guiding the further development of DFT and time-dependent DFT methods for VTC-XES predictions and their comparison to experiment.

Direct Observation of 4f Intrashell Excitation in Luminescent Eu Complexes by Time-Resolved X-ray Absorption Near Edge Spectroscopy

Abstract: We report time-resolved X-ray absorption near edge structure (TR-XANES) measurements at the Eu L3 edge upon photoexcitation of several EuIII-based luminescent lanthanide complexes. We find an unambiguous signature of the 4f intrashell excitation that occurs upon energy transfer from the photoactive organic antennas to the lanthanide species. Phenomenologically, this observation provides the basis for direct investigation of a crucial step in the energy transfer pathways that lead to sensitized luminescence in lanthanide-based dyes. Interestingly, the details of the TR-XANES feature suggest that the degree of 4f–5d hybridization may itself vary depending on the excited state of the EuIII ion.

Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice.

Abstract: Hydrogen-rich superhydrides are believed to be very promising high-Tc superconductors. Recent experiments discovered superhydrides at very high pressures, e.g. FeH5 at 130 GPa and LaH10 at 170 GPa. With the motivation of discovering new hydrogen-rich high-Tc superconductors at lowest possible pressure, here we report the prediction and experimental synthesis of cerium superhydride CeH9 at 80–100 GPa in the laser-heated diamond anvil cell coupled with synchrotron X-ray diffraction. Ab initio calculations were carried out to evaluate the detailed chemistry of the Ce-H system and to understand the structure, stability and superconductivity of CeH9. CeH9 crystallizes in a P63/mmc clathrate structure with a very dense 3-dimensional atomic hydrogen sublattice at 100 GPa. These findings shed a significant light on the search for superhydrides in close similarity with atomic hydrogen within a feasible pressure range. Discovery of superhydride CeH9 provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides. Hydrogen-rich superhydrides are promising high-temperature superconductors which have been observed only at pressures above 170 GPa. Here the authors show that CeH9 can be synthesized at 80-100 GPa with laser heating, and is characterized by a clathrate structure with a dense 3-dimensional atomic hydrogen sublattice.

Journal of Physics B: atomic, molecular and optical physics

Abstract: Journal of Applied Spectroscopy | HomeNuclear Instruments and Methods in Physics Research Atomic Physics authors/titles recent submissionsHome IOP PublishingPhysics Reports Journal ElsevierJournal WikipediaApplied Physics B | HomeThe European Physical Journal D (EPJ D)Chinese Physics B IOPscienceUkrainian Journal of PhysicsJournal of the Optical Society of America B JOSA BInternational Journal of Modern Physics B World ScientificJournal rankings for ARC, all 01* categories sorted Physics WikipediaInternational Scholarly Research Notices | HindawiAbbreviations A B Bioscience Journal Abbreviations Physical Review BEPJ European Physical JournalJournal of Vacuum Science & Technology BScitation HomeInternational Journal of Modern Physics E World ScientificJournal of Physics B: Atomic, Molecular and Optical The European Physical Journal B (EPJ B)Physical Review AAuthors Scientific Papers GS JournalJournal of Physics: Conference Series Latest Impact Factor Canadian Journal of Physics Canadian Science PublishingNuclear Physics B | Journal | ScienceDirect.com by Elsevier International Journal of Modern Physics E. Nuclear Physics. ISSN (print): 0218-3013 | ISSN (online Polarizability effects in atomic nuclei J. N. Orce Vol to provide the scientific background for future joint projects between the experts from these diverse areas in hadron physics. (Read full article.) Neutron star equations of state and GS Journal is your leading platform for high quality science journals, scientific papers and peer-reviewed full-text journals />07-12-2021 � The European Physical Journal D (EPJ D) presents new and original research results in Atomic, Molecular, Optical and Plasma Physics29-11-2021 � Editors' Choice Canadian Journal of Physics Cross sections and ionization rates are atomic data that have important applications in astrophysics and plasma physics. This work aims to calculate the electron impact ionization cross sections of some helium-like ions using the relativistic distorted wave method implemented in Flexible Atomic Code.Nuclear Physics B focuses on the domain of high energy physics, quantum field theory, statistical systems, and mathematical physics, and includes four main sections: high energy physics phenomenology, high energy physics theory, high energy physics experiment, and quantum field theory, ⋯. Read more18-08-2021 � Title abbreviations for journals in the areas of biology and chemistry. Bioscience journal title abbreviations A B.The American Physical Society (APS) is delighted to announce the appointment of David Scanlon, Professor of Computational Materials Design, University College of London, United Kingdom, to the role of Lead Editor of PRX Energy, APS’s new, highly selective, open access journal covering energy science and technology.Professor Scanlon will serve as the inaugural Lead Editor of ⋯15-12-2021 � Journal Impact IF Ranking � In the Physics and Astronomy (all) research field, the Quartile of Journal of Physics: Conference Series is Q4. Journal of Physics: Conference Series has been ranked #191 over 233 related journals in the Physics and Astronomy (all) research category. The ranking percentile of Journal of Physics: Conference Series is ⋯30-11-2021 � 14-b Metrolohichna str., Kyiv, Ukraine, 03028 Tel: +380(44) 521-31-88 E-mail: ujp@bitp.kiev.ua Scope: Ukrainian Journal of Physics is the general physics edition of the Department of Physics and Astronomy of the National Academy of Sciences of Ukraine.Journal Rankings proposed by the Austral. Math. Society, FoR codes 01*15-10-2021 � Journal of Vacuum Science and Technology B is an interdisciplinary journal focused on nanotechnology and microelectronic devices and processing, devoted to publishing reports of original research, letters, and review articles.Journal of Applied Physics Aug 23 2016. Shaping the Understanding the nature of the forces that both control and result from the molecular and atomic arrangements in matter will help shed light on chemical interactions in nature and can therefore lead to cures for disease.Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.. Physics is one of the oldest academic disciplines and, through its inclusion of ⋯Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C).Topic Scope: JOSA B emphasizes scientific research on the fundamentals of the interaction of light with matter such as quantum optics, nonlinear optics, and laser physics. Topics include atom optics and cold atoms, integrated and fiber optics, metamaterials, nanophotonics, photonic crystals, photorefractive optics and holography, physics of optical materials, spectroscopy, ⋯Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. Submit an article opens in new tab Track my article opens in new tab. RSS. Sign up for Phys. Rev. B 104, 174443 (2021) Quantized phase-coherent heat transport of counterpropagating Majorana modes Alexander G. Bauer et al. Phys. Rev. B 104, L201410 (2021) Soft-mode anisotropy in the negative thermal expansion material ReO 3 Tobias A. Bird et al. Phys. Rev. B 104, 214102 (2021) Critical drag as a mechanism for resistivityInternational Journal of Modern Physics B Condensed Matter Physics; Statistical Physics; Atomic, Molecular and Optical Physics ISSN (print): 0217-9792 | ISSN (online): 1793-6578We publish academic journals, as well as books and conference proceedings. All our academic publications are hosted on IOPscience, a platform specifically designed to help readers access scientific, technical and medical content quickly and easily.. We also provide expert science journalism through Physics World, a trusted source of science news.04-11-2021 � Journal of Applied Spectroscopy reports on key applications of spectroscopy in, physics, chemistry , material science, medicine, biology, ecology and spectral instrument-industry . An increasing number of papers presented here focus on the theory of lasers, as well as on the tremendous potential for the practical applications of lasers in numerous fields and industries.A journal, from the Old French journal (meaning "daily"), may refer to: . Bullet journal, a method of personal organizations; Diary, a record of what happened over the course of a day or other period; Daybook, also known as a general journal, a daily record of financial transactions; Logbook, a record of events important to the operation of a vehicle, facility, or otherwise29-11-2021 � EPJ B Topical Issue: Recent developments in the functional renormalization group approach to correlated electron systems ; EPJ D Topical Issue: Advances in Multi-Scale Modelling of Intense Electronic Excitation Processes ; EPJ D Topical Issue: Atomic, Molecular and Optical Techniques for Fundamental PhysicsInternational Journal of Differential Equations. Journal metrics. Acceptance rate 25%. Submission to final decision 46 days. Acceptance to publication 47 days. CiteScore 1.900. Journal Citation Indicator 0.520. Impact Factor-APC $1025. International Journal of Microbiology. Journal metrics.14-12-2021 � Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues.02-05-2017 � Physics Reports keeps the active physicist up-to-date on developments in a wide range of topics by publishing timely reviews which are more extensive than just literature surveys but normally less than a full monograph. Each report deals with one specific subject and is generally published in a separate volume. These reviews are specialist in nature but contain ⋯NIMB or Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for ⋯ Read more13-11-2021 � The European Physical Journal B Statistical and Nonlinear Physics First-passage time and change of entropy. V. V. Ryazanov. Eur. Phys. J. B, 94 12 (2021) 242. Published online: 11 December 2021. DOI: 10.1140/epjb/s10051 12th International Conference on Atomic and Molecular Data and Their Applications 25-29 September 2022 12-08-2021 � Subjects: Atomic Physics (physics.atom-ph); Chemical Physics (physics.chem-ph); Quantum Physics (quant-ph) [8] arXiv:2108.05996 [ pdf , other ] Title: Ultracold $^{88}\rm{Sr}_2$ molecules in the absolute ground state Copyright code : f0a76c2d68cb7e7cb469c606fb9f8c72

In situ analytical techniques for battery interface analysis

Abstract: Lithium-ion batteries, simply known as lithium batteries, are distinct among high energy density charge-storage devices. The power delivery of batteries depends upon the electrochemical performances and the stability of the electrode, electrolytes and their interface. Interfacial phenomena of the electrode/electrolyte involve lithium dendrite formation, electrolyte degradation and gas evolution, and a semi-solid protective layer formation at the electrode–electrolyte interface, also known as the solid–electrolyte interface (SEI). The SEI protects electrodes from further exfoliation or corrosion and suppresses lithium dendrite formation, which are crucial needs for enhancing the cell performance. This review covers the compositional, structural and morphological aspects of SEI, both artificially and naturally formed, and metallic dendrites using in situ/in operando cells and various in situ analytical tools. Critical challenges and the historical legacy in the development of in situ/in operando electrochemical cells with some reports on state-of-the-art progress are particularly highlighted. The present compilation pinpoints the emerging research opportunities in advancing this field and concludes on the future directions and strategies for in situ/in operando analysis.