A5009589624- Nuclear physics research studies
- Nuclear Physics and Applications
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear reactor physics and engineering
- Quantum, superfluid, helium dynamics
- High-Energy Particle Collisions Research
- Astronomical and nuclear sciences
- Electron and X-Ray Spectroscopy Techniques
- Machine Learning in Materials Science
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Radiation Therapy and Dosimetry
- Synthesis and Properties of Aromatic Compounds
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- Advanced NMR Techniques and Applications
- Radiopharmaceutical Chemistry and Applications
- Medical Imaging Techniques and Applications
- Surface and Thin Film Phenomena
- Scientific Research and Discoveries
- Particle Accelerators and Free-Electron Lasers
- Molecular Junctions and Nanostructures
University of Warwick
2019-2023
Royal Military Academy
2020
Culham Science Centre
2017
Imperial College London
2012-2014
University of Oxford
1965-2014
Southern Health and Social Care Trust
2014
University of Glasgow
1993-2002
Kelvin Nanotechnology (United Kingdom)
1974-1996
Natural Philosophy Institute
1968
National University of Ireland
1965
We have measured precise total and differential cross sections for the reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}p\ensuremath{\eta}$ from threshold to 790 MeV at MAMI accelerator in Mainz with neutral meson spectrometer TAPS. Resonance parameters of ${S}_{11}$(1535) resonance electromagnetic coupling $\ensuremath{\gamma}p\ensuremath{\rightarrow}{S}_{11}$ been extracted data. Contributions ${D}_{13}$(1520) $\ensuremath{\eta}$ photoproduction region identified first time via...
We present a photocathode assembly for the visible-light-driven selective reduction of CO2 to CO at potentials below thermodynamic equilibrium in dark. The photoelectrode comprises porous p-type semiconducting NiO electrode modified with visible-light-responsive organic dye P1 and reversible cycling enzyme carbon monoxide dehydrogenase. direct electrochemistry enzymatic electrocatalyst on shows that dark electrocatalytic behavior is rectified toward oxidation, reactivity being governed by...
The small electric quadrupole $E2$ amplitude of the predominantly magnetic dipole $M1$ $p\ensuremath{\rightarrow}\ensuremath{\Delta}(1232)$ transition has been measured using 270 to 420 MeV tagged linearly polarized photons in $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},p){\ensuremath{\pi}}^{o}$ reaction at Mainz Microtron MAMI. Differential cross sections and photon asymmetries were determined by measuring recoil proton cylindrically symmetric $4\ensuremath{\pi}$ detector...
Tagged-photon measurements of the $^{12}\mathrm{C}(\ensuremath{\gamma},pn)$ reaction in photon energy range 83-133 MeV are reported. The have achieved a good angular resolution, \ensuremath{\simeq}4\ifmmode^\circ\else\textdegree\fi{}, and better missing-energy \ensuremath{\simeq}8 MeV, than any previous measurement. This has allowed events to be selected which both neutron proton ejected from $1p$ shell $^{12}\mathrm{C}$ nucleus. correlation momenta outgoing nucleon pairs is quantitatively...
X-ray photoemission (XPS) and near edge x-ray absorption fine structure (NEXAFS) spectroscopy play an important role in investigating the electronic of materials surfaces.Ab initiosimulations provide crucial support for interpretation complex spectra containing overlapping signatures. Approximate core-hole simulation methods based on density functional theory (DFT) such as delta-self-consistent-field (ΔSCF) method or transition potential (TP) are widely used to predictK-shell XPS NEXAFS...
Defects play a critical role for the functionality and performance of materials, but understanding related effects is often lacking, because typically low concentrations defects make them difficult to study. A prominent case topological in two-dimensional materials such as graphene. The graphene-based (opto-)electronic devices depends critically on properties graphene/metal interfaces at contacting electrodes. question how these interface depend ubiquitous graphene high practical relevance,...
The performance of graphene-based (opto)electronic devices depends critically on the graphene/metal interface formed at metal contacts. We show here that properties may be controlled by topological defects, such as pentagon–heptagon (5–7) pairs, because their strongly enhanced bonding to metal. To measure bond energy and other key not accessible for embedded we use azulene a molecular model 5–7 defect. Comparison its isomer naphthalene, which represents regular graphene structure, reveals...
Abstract Diamond-based materials have unique properties that are exploited in many electrochemical, optical, thermal, and quantum applications. When grown via chemical vapor deposition (CVD), the growth rate of (110) face is typically much faster than other two dominant crystallographic orientations, (111) (100). As such, achieving sufficiently large-area high-quality (110)-oriented crystals challenging requires post-growth processing surface. Whilst CVD confers hydrogen terminations on...
Interfaces between polycyclic π-electron systems and metals play prominent roles in organic or graphene-based (opto)electronic devices, which performance-related parameters depend critically on the properties of metal/semiconductor contacts. Here, we explore how topology system influences bonding electronic interface. We use azulene as a model for nonalternant pentagon–heptagon (5–7) ring pairs compare it to its isomer naphthalene, represents alternant 6–6 pair. Their coverage-dependent...
Pyrene derivatives play a prominent role in organic electronic devices, including field effect transistors, light emitting diodes, and solar cells. The flexibility the desired properties has previously been achieved by variation of substituents at periphery pyrene backbone. In contrast, influence topology central π-electron system on relevant such as band gap or fluorescence behavior not yet addressed. this work, is compared with its structural isomer azupyrene, which non-alternant topology....
The total cross section for the $\ensuremath{\gamma}n\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ reaction has been measured over photon energy range 450--800 MeV at 855 MAMI Microtron in Mainz with large acceptance detector DAPHNE and using a deuterium target. As expected, this very similar to $\ensuremath{\gamma}p\ensuremath{\rightarrow}n{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ channel its amplitude is strongly underestimated by existing double...
The invariant mass distributions of the $\ensuremath{\gamma}\stackrel{\ensuremath{\rightarrow}}{n}p{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ reaction have been determined from a measurement in photon energy range $500\ensuremath{-}800 \mathrm{MeV}$ at MAMI Mainz accelerator with large acceptance detector DAPHNE and using deuterium target. At higher energies, spectra $({\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0})$ system show peak larger values, signature...