A5038873512- Nuclear Physics and Applications
- Advanced Condensed Matter Physics
- ZnO doping and properties
- X-ray Spectroscopy and Fluorescence Analysis
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Ion-surface interactions and analysis
- Advanced Chemical Physics Studies
- Nuclear physics research studies
- Magneto-Optical Properties and Applications
- Radioactive element chemistry and processing
- Nuclear materials and radiation effects
- Transition Metal Oxide Nanomaterials
- High-pressure geophysics and materials
- Ga2O3 and related materials
- Particle physics theoretical and experimental studies
- Trace Elements in Health
- Advanced NMR Techniques and Applications
- Nuclear Materials and Properties
- Advanced Semiconductor Detectors and Materials
- High Entropy Alloys Studies
- Ferroelectric and Piezoelectric Materials
- Catalytic Processes in Materials Science
University of Duisburg-Essen
2017-2025
European Organization for Nuclear Research
2016-2025
University of Manchester
2019
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2017
Tracer diffusion is one of most reliable techniques for providing basic kinetic data in solids. In the present review, selected direct methods, particular radiotracer measurements as a superior technique due to its high sensitivity, Secondary-Ion-Mass-Spectroscopy (SIMS) profiling, X-Ray Diffraction and Rutherford Backscattering Spectrometry are presented discussed. Special attention put on describing currently used sectioning detail with focus experimental applications complications. The...
Solid state physics (SSP) research at ISOLDE has been running since the mid-1970s and accounts for about 10%–15% of overall programme. is world flagship on-line production exotic radioactive isotopes, with high yields, elemental selectivity isotopic purity. Consequently, it hosts a panoply state-of-the-art nuclear techniques which apply methods to on life sciences, material science bio-chemical physics. The ease detecting radioactivity—<1 ppm concentrations—is one features distinguishes use...
It is still an open question if magnetoelectric coupling occurs at the atomic scale in multiferroic <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>BiFeO</a:mi></a:mrow><a:mn>3</a:mn></a:msub></a:mrow></a:math>. Nuclear solid-state techniques monitor local fields scale. Using such approach, we show that, contrary to our own expectation, ferroelectric and magnetic ordering bismuth ferrite (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Accurate nuclear quadrupole moment values are essential as benchmarks for structure models and the interpretation of experimentally determined interactions in terms electronic molecular structure. Here, we present a novel route to such data by combining perturbed $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ angular correlation measurements on free small linear molecules, realized first time within this work, with state-of-the-art ab initio calculations electric field...
Time differential perturbed angular correlation (TDPAC) of γ-rays spectroscopy has been applied in chemistry and biochemistry for decades. Herein we aim to present a comprehensive review chemical biochemical applications TDPAC conducted at ISOLDE over the past 15 years, including elucidation metal site structure dynamics proteins model systems. β-NMR is well established nuclear physics, solid state materials science, but only limited number have appeared. Current endeavors advancing towards...
Arsenic is highly toxic and a significant threat to human health, but certain bacteria have developed defense mechanisms initiated by As
Work of numerous research groups has shown different outcomes studies the transition from ferroelectric $\ensuremath{\alpha}$-phase to high temperature $\ensuremath{\beta}$-phase multiferroic, magnetoelectric perovskite Bismuth Ferrite (${\mathrm{BiFeO}}_{3}$ or BFO). Using perturbed angular correlation (PAC) method with $^{111m}\mathrm{Cd}$ as probe nucleus, $\ensuremath{\alpha}$ $\ensuremath{\beta}$ phase was characterized. The temperature, change crystal structure, and its parameters were...
The idea that “new-is-small” is a paradigm propelling industries and research: new materials for applications technologies. Precise efficient characterization techniques are, therefore, required to make the “new” “small”, understandable, applicable, reliable. Within this concept, Time Differential Perturbed Angular Correlations, TDPAC, appears as one of most exotic characterize celebrating 40 years at ISOLDE, CERN. In overview we explore TDPAC measurement possibilities ISOLDE-CERN solid...
Abstract Intracellular Cu I is controlled by the transcriptional regulator CueR, which effectively discriminates between monovalent and divalent metal ions. It intriguing that Hg II does not activate transcription, as bis‐thiolate sites exhibit high affinity for . Here binding of to CueR a truncated variant, ΔC7‐CueR, without last 7 amino acids at C‐terminus including conserved CCHH motif explored. ESI‐MS demonstrates up two bind while ΔC7‐CueR accommodates only one 199m PAC UV absorption...
In this paper, we present a study of the temperature-dependent characteristics electromagnetic fields at atomic scale in multiferroic bismuth ferrite (${\mathrm{BiFeO}}_{3}$ or BFO). The was performed using time differential perturbed angular correlation (TDPAC) spectroscopy on implanted $^{111}\mathrm{In}$ ($^{111}\mathrm{Cd}$) probes over wide temperature range. TDPAC spectra show that substitutional ${\mathrm{Fe}}^{3+}$ site experiences local electric polarization, which is otherwise...
The local environment in titanium dioxide was studied by the time dependent perturbed γ-γ angular correlation of 111In/111Cd and 181Hf/181Ta at Helmholtz-Institut für Strahlen-und Kernphysik, Bonn. An introduction to implantation methodologies performed Bonn Radioisotope Separator is presented. investigation carried out on thin films, which were deposited magnetic sputtering Si. results show two different sites for both probe nuclei with unique electric quadrupole interaction. Using 111Cd...
The $^{7}\mathrm{Be}(n,p)$ cross section was measured with an ion-implanted $^{7}\mathrm{Be}$ target at a thermal neutron beam of the research reactor LVR-15 in \ifmmode \check{R}\else \v{R}\fi{}e\ifmmode \check{z}\else \v{z}\fi{}. to ground state $^{7}\mathrm{Li}$ is $\ensuremath{\sigma}(n,{p}_{0})=43800\ifmmode\pm\else\textpm\fi{}1400\phantom{\rule{0.28em}{0ex}}\mathrm{b}$ and first excited $\ensuremath{\sigma}(n,{p}_{1})=520\ifmmode\pm\else\textpm\fi{}260\phantom{\rule{0.28em}{0ex}}\mathrm{b}$.
In this study we report on the results from emission $^{57}$Fe M${\"o}$ssbauer Spectroscopy experiments, using dilute $^{57}$Mn implantation into pristine (TiO$_2$) and hydrogenated anatase held at temperatures between 300-700 K. Results of electronic structure local environment are complemented with ab-initio calculations. Upon both Fe$^{2+}$ Fe$^{3+}$ observed in anatase, where latter demonstrates spin-lattice relaxation. The spectra obtained for show no contribution, suggesting that...
This manuscript describes the production of three targets obtained by implantation different activities 7Be into thin aluminium disks. Two produced were used to measure 7Be(n, p)7Li cross section in energy range interest for Big-Bang Nucleosynthesis. A third target was sections and α)7Li nuclear reactions with cold thermal neutrons, respectively. paper also characterization first two targets, performed after neutron irradiation, terms implanted spatial distributions.
Using time-differential perturbed angular correlation of γ rays, we investigated the electric-field gradient polycrystalline EuTiO3 and Eu2Ti2O7, with 181Hf(181Ta) as a probe, following different thermal treatments. The measurements were performed at ISOLDE-CERN 80 keV implantation Bonn Radioisotope Separator. experimental results indicated successful induction phases in recovery process 1273 1373 K. These observations combined ab initio calculations X-ray diffraction measurements. A...
Isolated nonmagnetic substitutional defect ions experience huge coupled electric magnetic interaction in the single-phase multiferroic ${\mathrm{BiFeO}}_{3}$. In ferroelectric state above N\'eel temperature ${T}_{N}$, environment generates a single symmetric field gradient (EFG) parallel to polarization direction. Below distinct arises, monitored by probe nuclei via their moment. Two environments arise, given relative angle of local moment within its easy plane with respect EFG orientation....
Sc diffusion in hexagonal close packed Al15Hf25Sc10Ti25Zr25 and Al5Hf25Sc20Ti25Zr25 high-entropy alloys is measured using the CERN facility for implantation of 46Sc isotope. The diffusivity found to be slower than that previously Ti both alloys. Ab initio-informed calculations are used quantify interplay chemical complexity local atomic strains. mean-square displacements shown contribute observed "anti-sluggish" behavior these
In this paper, we investigate the solubility effects of Co in ZnO (Zn1−xCoxO, where x = 0, 0.03, 0.05, 0.1, 0.2, 0.25, 0.4, 0.8, and 1) by combining results perturbed angular correlation (PAC) spectroscopy using highly diluted 111Cd as probe nuclei ab initio calculations based on spin-density functional theory (SDFT). This combined approach enables us to characterize local structure around Cd ions, where, through PAC technique, it was possible measure EFG a function temperature concentration...
In this paper, we investigate the effects of doping in local structure SnO2 by measuring hyperfine interactions at impurity nuclei using Time Differential Perturbed Gamma-Gamma Angular Correlation (TDPAC) method addition to density functional theory simulations. The field parameters have been probed as a function temperature thin film samples. experimental results reveal that 117Cd/In and 111In/Cd are incorporated stabilized lattice replacing cationic site. Significant differences electric...
111Ag-perturbed angular correlation of γ-rays (PAC) spectroscopy provides information on the nuclear quadrupole interactions, and thereby local structure dynamics silver ion binding site. Brownian rotational motion, i.e. diffusion, 111Ag-labeled molecules will significantly affect PAC spectra. Here we illustrate this effect, by simulating 111Ag spectra for with molecular masses spanning from 102 to 106 g/mol, reflecting a span fast (small molecules) slow (large diffusion time scale. The...
The time differential perturbed angular correlation, TDPAC, technique has been used for several decades to study electric quadrupole hyperfine interactions in semiconductors such as dynamic (DQI) resulting from after-effects of the nuclear decay well static originating defects around probe nuclei interstitial ions, stresses crystalline structure, and impurities. Nowadays, quality available semiconductor materials is much better, allowing us purely interactions. We present TDPAC measurements...