A5013743857- Advanced Chemical Physics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Spectroscopy and Quantum Chemical Studies
- Atomic and Molecular Physics
- Magnetic properties of thin films
- Advanced X-ray Imaging Techniques
- Quantum, superfluid, helium dynamics
- Laser-Matter Interactions and Applications
- Spectroscopy and Laser Applications
- Magnetic Properties and Applications
- Crystallography and Radiation Phenomena
- Magnetic Properties of Alloys
- Magneto-Optical Properties and Applications
- Advanced Electron Microscopy Techniques and Applications
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Soil and Water Nutrient Dynamics
- Photochemistry and Electron Transfer Studies
- Advanced X-ray and CT Imaging
- Lung Cancer Diagnosis and Treatment
- Atmospheric Ozone and Climate
- Microstructure and mechanical properties
- Lysosomal Storage Disorders Research
- Electrochemical Analysis and Applications
Uppsala University
2016-2025
Colorado State University
2024
Lawrence Livermore National Laboratory
2023
Vaasa Central Hospital
2020-2022
Folkhälsans Forskningscentrum
2016-2020
Institute for Molecular Medicine Finland
2016
University of Helsinki
2016
Synchrotron soleil
2009-2013
AstraZeneca (Sweden)
2008-2010
Lawrence Berkeley National Laboratory
2007-2010
A novel radioligand for positron emission tomography (PET) imaging of serotonin 5-HT 1B receptors, [ 11 C]AZ10419369, has been recently described. In this study, the potential quantitative analysis C]AZ10419369 binding to central receptors was evaluated in human subjects. PET measurements were performed after injection 10 Data analyzed with kinetic modeling and linear graphical using arterial plasma as input function, reference tissue models cerebellar cortex region. Binding highest...
Dissociative nuclear motion in core-excited molecular states leads to a splitting of the fragment Auger lines: Auger-Doppler effect. We present here for first time experimental evidence an effect following F1s → a(1g)* inner-shell excitation by circularly polarized x rays SF(6). In spite uniform distribution dissociating S-F bonds near polarization plane light, intersection between subpopulation molecules selected core with cone dissociation induces strong anisotropy that contributes...
We report highly surface sensitive core-level photoelectron spectra of small carboxylic acids (formic, acetic and butyric acid) their respective carboxylate conjugate base forms (formate, acetate butyrate) in aqueous solution. The relative propensity the carboxylates is obtained by monitoring C1s signal intensities from a solution which bulk concentrations are equal. All found to be enriched at corresponding carboxylates. By PE signals acid as function total concentration, we find that...
Resonant inelastic x-ray scattering (RIXS) is a major method for investigation of electronic structure and dynamics, with applications ranging from basic atomic physics to materials science. In RIXS applied inversion-symmetric systems, it has generally been accepted that strict parity selectivity applies in the sub–kilo–electron volt region. contrast, we show selection rule violated spectra free homonuclear diatomic O 2 molecule. By analyzing spectral dependence on angle, demonstrate...
Dissociation upon sulfur <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>K</a:mi></a:math>-shell excitation or ionization of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:msub><c:mrow><c:mi>SF</c:mi></c:mrow><c:mrow><c:mn>6</c:mn></c:mrow></c:msub></c:mrow></c:math> is studied by <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>L</e:mi></e:math>-shell emission spectroscopy using synchrotron radiation...
X-ray photoemission spectroscopy is used in a great variety of research fields; one observable the sample's stoichiometry. The stoichiometry can be deduced based on expectation that ionization cross sections for innershell orbitals are independent molecular composition. Here we chlorine-substituted ethanes gas phase to investigate apparent carbon We observe nonstoichiometric ratio wide range photon energies, exhibits x-ray-absorption fine structure (EXAFS)-like oscillations and hundreds eV...
Abstract. Dilute aqueous solutions of the atmospheric organic surfactant sodium decanoate have been studied using surface sensitive X-ray photoelectron spectroscopy combined with synchrotron radiation. We decanoate/decanoic acid speciation and preferential adsorption at vapor–liquid interface, responses to mixing in solution some most common inorganic ions, Na+, NH4+, Cl−, SO42−. observe little or no influence SO42− on neither relative nor individual properties decanoic acid. In particular,...
We present and analyze high resolution near edge X-ray absorption fine structure (NEXAFS) spectra of CO+ at the carbon oxygen K-edges. The show a wealth features that appear very differently two analysis these can be divided into three parts; (i) repopulation transition to open shell orbital - here C(1s) or O(1s) 5σ transition, where normal core hole state is reached from different initial interaction than in photoelectron spectroscopy; (ii) spin coupled split valence bands corresponding π*...
A nontrivial balance between Coulomb repulsion and kinematic effects determines the electronic structure of correlated electron materials. The use electromagnetic fields strong enough to rival these native microscopic interactions allows us study response as well time scales energies involved in using quantum for possible applications. We element-specific transient x-ray absorption spectroscopy high-harmonic generation measure ultrashort off-resonant optical prototypical insulator NiO....
The angle-resolved resonant Auger spectrum of Xe is investigated with a record high meV energy resolution in the kinetic region 34.45–39.20 eV at hν=65.110 eV, corresponding to excitation Xe* 4d5/2−16p state. New lines have been observed and assigned spectra. results previous measurements concerning energies, intensities angular distribution asymmetry parameters refined, complemented and, for some lines, corrected.
This paper describes the philosophy and design goals regarding construction of a versatile sample environment: source capable producing beams atoms, molecules, clusters, nanoparticles in view studying their interaction with short wavelength (vacuum ultraviolet x-ray) synchrotron radiation. In design, specific care has been taken (a) use standard components, (b) ensuring modularity, i.e., that swiftly switching between different experimental configurations was possible. To demonstrate...
Nonlinear x-ray spectroscopy The extension of nonlinear optics to the spectral domain is a promising direction in development spectroscopy. Although theoretical concepts were developed decades ago, scientists still struggle implement them because elusive nature effects. Eichmann et al. now present atomic momentum (AMS), which based on detection scattered atom after transfer from photons (see Perspective by Pfeifer). authors show how AMS can observe stimulated Raman scattering signals at neon...
Through the combination of surface sensitive photoelectron spectroscopy and molecular dynamics simulation, relative propensities guanidinium ammonium ions in aqueous solution are characterized. The fact that N 1s binding energies differ between these two species was exploited to monitor their concentration through respective photoemission intensities. Aqueous solutions chloride, mixtures salts, have been studied a wide range, it is found ion has greater propensity reside at than ion. A large...
Seeded free electron lasers theoretically have the intensity, tunability, and resolution required for multiphoton spectroscopy of atomic molecular species. Using seeded laser FERMI a novel detection scheme, we revealed two-photon excitation spectra dipole-forbidden doubly excited states in helium. The spectral profiles lowest $(\ensuremath{-}1,0{)}^{+1}$ $^{1}{S}^{e}$ $(0,1{)}^{0}$ $^{1}{D}^{e}$ resonances display energy shifts meV range that depend on pulse intensity. results are explained...
Born–Oppenheimer and Franck–Condon approximations are two major concepts in the interpretation of electronic excitations modeling spectroscopic data gas condensed phases. We report large variations anisotropy parameter (β) for fully resolved vibrational sub-states X2Πg ground state O+2 populated by participator resonant Auger decay following K-shell electrons into σ☆ resonance monochromatic x-rays. Decay spectra light polarization directions parallel perpendicular to electron detection axis...
In this paper, we present the HELIOS (High Energy Laser Induced Overtone Source) laboratory, an in-house high-order harmonic generation facility which generates extreme ultraviolet (XUV) photon pulses in range of 15-70 eV with monochromatized XUV pulse lengths below 35 fs. is a source for time-resolved pump-probe/two-color spectroscopy sub-50 fs range, can be operated at 5 kHz or 10 kHz. An optical parametric amplifier available pump-probe experiments wavelengths ranging from 240 nm to...
Using element-specific measurements of the ultrafast demagnetization Ru/${\mathrm{Fe}}_{65}{\mathrm{Co}}_{35}$ hetero-structures, we show that Ru can exhibit a significant magnetic contrast (3% asymmetry) resulting from spin currents emanating process FeCo layer. We use this to investigate how superdiffusive are affected by doping heavy elements in find strongly suppressed, and recovery slows down Re doping. This is accordance with change interface reflectivity as found transport model.
X-ray-emission threshold-electron coincidence spectroscopy has been applied to ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, and ${\mathrm{N}}_{2}\mathrm{O}$. The main features of the spectra can be interpreted as conventional core level threshold electron spectra, free from postcollision interaction effects. relative cross sections for adiabatic ionization close-lying hole states vibrational substates are presented. results compared theoretical predictions state-of-the-art photoelectron discussed...
State-of-the-art x-ray resonant photoemission spectroscopy combined with ab initio calculations maps out, for the first time, actual shapes of vibrational wave functions highly excited nitrogen molecules.
In this paper, we present a spectrometer that is designed for element-specific and time-resolved transverse magneto-optic Kerr effect experiments at the high-harmonic generation pump-probe facility High Energy Laser Induced Overtone Source (HELIOS) laboratory. HELIOS delivers photons with energies between 30 eV 72 an overall time resolution of less than 40 fs. The based on Rowland-circle geometry allows simultaneous measurements all magnetic transition-metal elements. setup also features...
Although different conservative treatment options have been proposed, there is a paucity of research on the management iliotibial band syndrome (ITBS) in runners.To compare two protocols for ITBS; radial shockwave therapy (RSWT) and manual (ManT). Both therapies were administered concurrently with an exercise rehabilitation programme.The study was designed as randomised controlled clinical trial. Twenty-four runners ITBS received 3 treatments at weekly intervals either RSWT (n= 11) or ManT...