A5021860147- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- Spectroscopy and Quantum Chemical Studies
- Mass Spectrometry Techniques and Applications
- nanoparticles nucleation surface interactions
- Advanced Electron Microscopy Techniques and Applications
- Advanced X-ray Imaging Techniques
- Advanced Physical and Chemical Molecular Interactions
- Photochemistry and Electron Transfer Studies
- Atmospheric chemistry and aerosols
- Fullerene Chemistry and Applications
- Atmospheric Ozone and Climate
- Laser-Matter Interactions and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallization and Solubility Studies
- Digital Holography and Microscopy
- Counseling Practices and Supervision
- Doctoral Education Challenges and Solutions
- Nuclear physics research studies
- Molecular Junctions and Nanostructures
- Analytical chemistry methods development
- Analytical Chemistry and Chromatography
- Particle Accelerators and Free-Electron Lasers
- Microfluidic and Capillary Electrophoresis Applications
Lund University
2015-2025
MAX IV Laboratory
2017-2025
National Synchrotron Radiation Research Center
2014
Universität Greifswald
2005-2010
FlexPES is a soft X-ray beamline on the 1.5 GeV storage ring at MAX IV Laboratory, Sweden, providing horizontally polarized radiation in 40–1500 eV photon energy range and specializing high-resolution photoelectron spectroscopy, fast absorption spectroscopy electron–ion/ion–ion coincidence techniques. The split into two branches currently serving three endstations, with possibility of adding fourth station free port. refocusing optics provides focal points each branch, enables either focused...
Metal oxide nanoparticles are essential in various applications, and the synthesis through gas-phase generation methods offers a rapid reliable pathway for nanoparticle production. Yet achieving precise control over their formation remains challenging due to complex nature of oxidation processes. While bulk states can be assessed via off-line measurements, dynamic surface is more difficult monitor optimize real time. Here, we investigate state unsupported tin using an aerosol sample-delivery...
Hydrogen migration is a ubiquitous phenomenon upon dissociation of organic molecules. Here we investigate the formation H 3 O + fragment after core-level photoionization and Auger decay in aminobenzoic acid molecules...
Ammonium nitrate in aqueous solution was investigated with synchrotron radiation based photoelectron spectroscopy using two types of liquid jet nozzles. Electron emission from a cylindrical microjet ammonium measured at different angles relative to the horizontal polarization incident radiation, 90° and 54.7° (the "magic angle"), for range photon energies (470–530 eV). We obtained β parameter values as function energy, on normalization procedure relying simulations background intensity SESSA...
CO2-rich planetary atmospheres are continuously exposed to ionising radiation driving major photochemical processes. In the Martian atmosphere, CO2 clusters predicted exist at high altitudes motivating a deeper understanding of their photochemistry. this joint experimental-theoretical study, we investigate photoreactions (≤2 nm) induced by soft X-ray ionisation. We observe dramatically enhanced production [Formula: see text] from photoionized compared case isolated molecule and identify two...
Nuclear motion in the N1s(-1)4a core-excited state of ammonia is investigated by studying angular anisotropy fragments produced decay highly excited molecule and compared with predictions from ab initio calculations. Two different fragmentation channels (H(+)/NH2(+) H(+)/NH(+)/H) reveal complex nuclear dynamics as excitation photon energy tuned through 4a1 resonance. The well-defined dissociation molecular dication species suggests a very rapid time scale limited to low fs timescale.
The production of aluminum cluster tetra-anions, and thus the first observation a tetra-anionic metal in gas-phase, is reported. polyanions were generated by use “electron-bath technique.” smallest tetra-anion observed was Al2154−, containing 14% fewer atoms than expected from classical estimates appearance size.
Ion traps are useful tools for many investigations on charged molecules and clusters. At ClusterTrap, the Penning trap is more than just a storage device. The split-ring electrodes allow radial excitations of trapped-ion motion such that ions can be centred in or ejected from it, thus allowing study size-selected extended ion-storage times have proven investigation reactions cluster-decay mechanisms. Collisional laser excitation been performed as well electron-impact ionization...
While largely studied on the macroscopic scale, dynamics leading to nucleation and fission processes in atmospheric aerosols are still poorly understood at molecular level. Here, we present a joint experimental-theoretical study of model system consisting hydrogen-bonded ammonia water molecules. Experimentally, clusters were produced via adiabatic co-expansion. Double ionization ionic products prepared using synchrotron radiation analyzed with coincidence mass- 3D momentum spectroscopy....
The charge and proton dynamics in hydrogen-bonded networks are investigated using ammonia as a model system. fragmentation of medium-sized clusters (1-2 nm) upon single photon multi-ionization is studied, by analyzing the momenta small ionic fragments. observed pattern doubly- triply-charged reveals spatial anisotropy emission between fragments (back-to-back). Protonated exhibit distinct kinematic correlation, indicating delay ionization (fission). different kinematics for channels...
ClusterTrap is a setup devoted to the investigation of atomic clusters. The Penning trap allows various studies after preceding preparation steps. In particular, clusters may be size selected and their charge state varied by electron impact ionization or attachment during storage. On other hand can used for extended properties trap. Both aspects are described with recent examples.
Azimuthal quadrupolar excitation is a commonly used technique in the field of ion cyclotron resonance mass spectrometry, particular combination with buffer-gas collisions to achieve axialization stored ions. If applied only one phase set two opposing ring segments (rather than “regular” method where sets electrodes are addressed opposite polarities), parametric effects at frequencies 2μ z and μ p = + – can lead unintended ejection ions from trap. These resonances have been revisited both...
Coherent Diffraction Imaging (CDI) is an experimental technique to get images of isolated structures by recording the light scattered off sample. Thanks extremely bright and short coherent pulses provided X-ray Free Electron Lasers, CDI makes it possible study nanostructures in gas phase time-resolved snapshots their ultrafast dynamics with unprecedented resolution. In principle, sample density can be recovered from field through a straightforward Fourier Transform operation. However, only...
Low-energy-electron emission from resonant Auger final states via intermolecular Coulombic decay (RA-ICD) has been previously described as a promising scenario for controlling radiation damage medical purposes, but so far only observed in prototypical atomic and molecular van der Waals dimers clusters. Here, we report the experimental observation of RA-ICD aqueous solution. We show that solvated Ca$^{2+}$ ions, can be very efficiently controlled by tuning photon energy exciting X-rays to...
One of the most challenging aspects X-ray research is delivery liquid sample flows into soft beam. Currently, cylindrical microjets are commonly used injection systems for spectroscopy. However, they suffer from several drawbacks, such as complicated geometry due to their curved surface. In this study, we propose a novel 3D-printed nozzle design by introducing microscopic flat sheet jets that provide micrometre-thick sheets with high stability, intending make technology more widely available...
Symmetry breaking and competition between electronic decay nuclear dynamics are major factors determining whether the memory of initial core-hole localisation in a molecule is retained long enough to affect fragmentation. We investigate fate core holes localised at different sites free 1,3 trans butadiene by using synchrotron radiation selectively excite electrons from C 1s π* orbitals. Fragmentation involving bonds site hole provides clear evidence for preferential bond located terminal...