A5055052666- Advanced Chemical Physics Studies
- CO2 Reduction Techniques and Catalysts
- Spectroscopy and Quantum Chemical Studies
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Organic Light-Emitting Diodes Research
- Photochemistry and Electron Transfer Studies
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Metal-Catalyzed Oxygenation Mechanisms
- Porphyrin and Phthalocyanine Chemistry
- Catalysis and Oxidation Reactions
- Surface Chemistry and Catalysis
- transportation and logistics systems
- Electron Spin Resonance Studies
- Magnetism in coordination complexes
- Metal complexes synthesis and properties
- Petri Nets in System Modeling
- Simulation Techniques and Applications
- Plasmonic and Surface Plasmon Research
- Laser-Matter Interactions and Applications
- X-ray Diffraction in Crystallography
- Optical Coatings and Gratings
- Electron and X-Ray Spectroscopy Techniques
- Composite Material Mechanics
- Photonic Crystals and Applications
Technical University of Denmark
2017-2023
Aalborg University
2014
Cowi (Denmark)
2008
Aarhus University
2003
Combined X-ray free-electron laser techniques pinpoints loci of intersections between potential energy surfaces a photo-excited 3d transition-metal centered molecule.
We report x-ray free electron laser experiments addressing ground-state structural dynamics of the diplatinum anion Pt_{2}POP_{4} following photoexcitation. The are tracked with <100 fs time resolution by scattering, utilizing anisotropic component to suppress contributions from bulk solvent. data exhibit a strong oscillatory period 0.28 ps and decay 2.2 ps, analysis difference signal directly shows this as arising along PtPt coordinate. These results compared multiscale Born-Oppenheimer...
Disentangling the dynamics of electrons and nuclei during nonadiabatic molecular transformations remains a considerable experimental challenge. Here we have investigated photoinduced electron transfer following metal-to-ligand charge-transfer (MLCT) excitation [Fe(bmip)2]2+ photosensitizer, where bmip = 2,6-bis(3-methyl-imidazole-1- ylidine)-pyridine, with simultaneous femtosecond-resolution Fe K{\alpha} K\b{eta} X-ray Emission Spectroscopy (XES) Wide Angle Scattering (WAXS). This...
By combining transient X-ray and optical studies, we reveal the solvent influence on excited state potential energy surfaces of [Fe(bpy)(CN)<sub>4</sub>]<sup>2−</sup>.
Experimental characterization of structure and energy a Fe N-heterocyclic carbene quintet state.
Iron N-heterocyclic carbene (NHC) complexes have received a great deal of attention recently because their growing potential as light sensitizers or photocatalysts. We present sub-ps X-ray spectroscopy study an FeII NHC complex that identifies and quantifies the states involved in deactivation cascade after absorption. Excited molecules relax back to ground state along two pathways: After population hot 3 MLCT state, from initially excited 1 30 % undergo ultrafast (150 fs) relaxation MC...
Time-resolved X-ray scattering patterns from photoexcited molecules in solution are many cases anisotropic at the ultrafast time scales accessible free-electron lasers (XFELs). This anisotropy arises interaction of a linearly polarized UV–Vis pump laser pulse with sample, which induces structural changes that can be captured by femtosecond pulses. In this work, method for quantitative analysis signal arising an ensemble is described, and it demonstrated how its use enhance sensitivity...
Resolving the structural dynamics of initial steps chemical reactions is challenging. We report femtosecond time-resolved wide-angle x-ray scattering photodissociation diiodomethane in cyclohexane. The data reveal with detail how molecule dissociates into radicals, radicals collide solvent, and they form photoisomer. extract translational rotational kinetic energy dispersed solvent. also find that 85% primary radical pairs are confined to their original solvent cage discuss this influences...
Resolving the structural dynamics of bond breaking, formation, and solvation is required for a deeper understanding solution-phase chemical reactions. In this work, we investigate photodissociation triiodide in four solvents using femtosecond time-resolved X-ray solution scattering following 400 nm photoexcitation. Structural analysis data resolves solvent-dependent evolution during cleavage, internal rearrangements, solvent-cage escape, reformation real time. The nature structure reaction...
Abstract Iron N‐heterocyclic carbene (NHC) complexes have received a great deal of attention recently because their growing potential as light sensitizers or photocatalysts. We present sub‐ps X‐ray spectroscopy study an Fe II NHC complex that identifies and quantifies the states involved in deactivation cascade after absorption. Excited molecules relax back to ground state along two pathways: After population hot 3 MLCT state, from initially excited 1 30 % undergo ultrafast (150 fs)...
Photoinduced electronic and structural changes of a hydrogen-generating supramolecular RuPt photocatalyst are studied by combination time-resolved photoluminescence, optical transient absorption, X-ray absorption spectroscopy. This work uses the element specificity techniques to focus on interplay between photophysical -chemical processes associated time scales at catalytic Pt moiety. We observe very fast (<30 ps) photoreduction site, followed an ∼600 ps step into strongly oxidized center....
The reflectivity of ultrasharp periodic groove arrays in a gold surface is studied for general direction light incidence. This includes the case incident propagating along grooves. Two efficient numerical modeling approaches are presented, namely, simple and approximate stack matrix method (SMM), which uses mode index gap-plasmon polaritons as an effective index, rigorous Green's function integral equation (GFSIEM). results highly SMM show remarkable similarity to exact obtained with GFSIEM,...