Quantitative Comparison of LDA + DMFT and ARPES Spectral Functions

JETP Letters - The emergence of angle-resolved photoemission spectroscopy (ARPES) made it possible to observe electronic dispersion directly as a spectral function map. On the other hand, a...     

Valence‐to‐core X‐ray emission spectroscopy of titanium compounds using energy dispersive detectors

X‐ray emission spectroscopy (XES) of transition metal compounds is a powerful tool for investigating the spin and oxidation state of the metal centers. Valence‐to‐core (vtc) XES is of special interest, as it contains information on the ligand nature, hybridization, and protonation. To date, most vtc‐XES studies have been performed with high‐brightness sources, such as synchrotrons, due to the weak fluorescence lines from vtc transitions. Here, we present a systematic study of the vtc‐XES for different titanium compounds in a laboratory setting using an X‐ray tube source and energy dispersive microcalorimeter sensors. With a full‐width at half‐maximum energy resolution of approximately 4 eV at the Ti Kβ lines, we measure the XES features of different titanium compounds and compare our results for the vtc line shapes and energies to previously published and newly acquired synchrotron data as well as to new theoretical calculations. Finally, we report simulations of the feasibility of performing time‐resolved vtc‐XES studies with a laser‐based plasma source in a laboratory setting. Our results show that microcalorimeter sensors can already perform high‐quality measurements of vtc‐XES features in a laboratory setting under static conditions and that dynamic measurements will be possible in the future after reasonable technological developments.     

Electronic Structure and Spectral-Fluorescent Properties of Thiopyrylo-4-Tricarbocyanine Laser Dyes

Optics and Spectroscopy - We found that the long-wavelength absorption band of the laser dye IR 1061 and its analogue with an unsubstituted polymethine chain is strongly broadened and decreases in...     

Analytical Description of the Spectral Characteristics of a Refractive Index Sensor Based on a Reflection Interferometer

Optics and Spectroscopy - For the first time, analytical formulas are presented that describe the spectral characteristics of a sensor based on a reflection interferometer for oblique incidence of...     

Search for Exoplanets: Status 2020

Radiophysics and Quantum Electronics - An overview of the history, status by mid-2020, and the nearest prospects for the search and study of planets outside the solar system—exoplanets, is...     

High-Power Free-Electron Masers Based on Linear Induction Accelerators

Radiophysics and Quantum Electronics - We review the results of theoretical and experimental studies of high-power free-electron masers (FEMs), which are performed jointly by the Joint Institute...     

Optical Properties of Three-Dimensional InGaP(As) Islands Formed by Substitution of Fifth-Group Elements

Optics and Spectroscopy - The optical properties of three-dimensional quantum-size InGaPAs islands, which are formed by substitution of phosphorous by arsenic in an InGaPAs layer deposited on GaAs...     

Determination of Rate Constants and the Mechanism of Phototransformations of Metalloporphyrins by Solving the Inverse Photokinetic Problem

Optics and Spectroscopy - Fluorescence kinetics of some substituted Zn- and Mg-porphyrins in solid polymeric films upon excitation by two-step-wise rectangular laser pulses and at 293 K are studied...     

Experimental Study of Ar-Gas Radiation Behind the Front of a Strong Shock Wave

Journal of Applied Spectroscopy - Emission spectra of argon behind the front of a strong shock wave are studied in the range of shock-wave velocities of 4.6–8.3 km/s and pressures before the...     

Dressed energy of the XXZ chain in the complex plane

We highlight what seems to be a remaining subtlety in the argument for the cancellation of the total anomaly associated with the M5-brane in M-theory. Then, we prove that this subtlety is resolved under the hypothesis that the C-field flux is charge-quantized in the generalized cohomology theory called J-twisted cohomotopy.