A5055383023- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
- Molecular Spectroscopy and Structure
- Lanthanide and Transition Metal Complexes
- Mass Spectrometry Techniques and Applications
- Ocular Surface and Contact Lens
- Material Dynamics and Properties
- Molecular Junctions and Nanostructures
- Advanced X-ray and CT Imaging
- X-ray Diffraction in Crystallography
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Advancements in Transdermal Drug Delivery
- nanoparticles nucleation surface interactions
- Chalcogenide Semiconductor Thin Films
- Polydiacetylene-based materials and applications
- Machine Learning in Materials Science
- Glass properties and applications
- Analytical Chemistry and Chromatography
- Surfactants and Colloidal Systems
- Quantum Dots Synthesis And Properties
- Organic and Inorganic Chemical Reactions
- Proteoglycans and glycosaminoglycans research
University of Helsinki
2024-2025
The University of Melbourne
2016-2022
One of the most common types experiment in X-ray absorption spectroscopy (XAS) measures secondary inelastically scattered fluorescence photon. This widespread approach has a dominant systematic self-absorption The large impact compromises accuracy, analysis and insight. Presented here is detailed self-consistent method to correct for attenuation measurements. resulting software package can be applied any data, XAS or other experimental detecting radiation, leading general solution applicable...
Molecular distortion of dynamic molecules gives a clear signature in the vibrational spectra, which can be modeled to give estimates energy barrier and sensitivity frequencies modes reaction coordinate. The coordinate method (RCM) utilizes ab initio-calculated spectra molecule its ground transition states together with their relative energies predict temperature dependence spectra. DFT-calculated eclipsed (D5h ) staggered (D5d forms ferrocene (Fc), deuterated analogue, within RCM explain IR...
The tear film lipid layer (TFLL) is a unique biological membrane that serves pivotal role in the maintenance of ocular surface health. Reaching an overarching understanding functional principle TFLL has been hampered by lack insights into structural and roles played individual classes. To bridge this knowledge gap, we herein focus on studying films formed principal classes scattering methods. Through grazing incidence X-ray diffraction reflectivity studies, reveal quantitative data about...
The tear film lipid layer (TFLL) plays a vital part in maintenance of ocular health and represents unique biological barrier comprising unusual specialized classes species. wax cholesteryl esters (WEs CEs) constitute roughly 80–90% the TFLL. majority species these are branched it is therefore surprising that synthesis properties second largest category species, i.e., anteiso-branched remain poorly characterized. In this study, we have developed total route completed detailed NMR...
We present a new technology for analyzing the molecular structure and in particular subtle conformational differences Ni complexes using X-ray absorption spectroscopy (XAS), enabling tighter more robust constraints of dynamic bond lengths. Self-absorption attenuating effects have large impact fluorescence compromising accuracy insight structural advanced analyses. correct these dominant systematic effects. investigate nickel(II) complexes, that is, bis(N-n-propyl-salicylaldiminato)...
Measurements of mass attenuation coefficients and X-ray absorption fine structure (XAFS) zinc selenide (ZnSe) are reported to accuracies typically better than 0.13%. The high accuracy the results presented here is due our successful implementation extended range technique, a relatively new methodology, which can be set up on most synchrotron beamlines. 561 were recorded in energy 6.8-15 keV with measurements concentrated at selenium pre-edge, near-edge fine-structure edge regions. This...
<title>Abstract</title> Knowing the pressure dependence of glass forming liquids is important in various contexts. Here, we study case supercooled water, which has at least two different amorphous states with densities. The dependencies transitions are predicted to show opposite behaviour, crossing P-T plane elevated pressure. While experimental identification transition and cold temperatures technically difficult, measurements on bulk water ices even more challenging, as interrupted by...
95% of XAS research uses measurement secondary fluorescence photons, which suffers from uncalibrated detector efficiencies and a dominant systematic self-absorption the photon, compromises accuracy, analysis, insight.We have developed, coded implemented novel self-consistent method to correct for seen in high-energy X-ray measurements [1,2].This resulting software package can be applied any data set.The complexes considered here, n-pr i-pr, been shown local metal environments with...
We apply a novel correction for the self-absorption distortion in fluorescence Xray Absorption Spectroscopy (XAS) data collected on both 15mM and 1.5mM Ni (II) complex solutions. Self-absorption is an inevitable systematic effect that distorts XAS limits available information content. This builds earlier project [1, 2] demonstrates this method valid dilute samples. Structural analysis of corrected yields significant new insight with tight constraints determined molecular structure dynamic...
The signature of molecular vibrations and distortions in dynamic molecules gives a complex fingerprint which is insightful can substantiate chemical hypotheses regarding conformer stability.Using high-accuracy experimental data ferrocene (Fc) deuterated (dFc, Fc-d 10 ) at temperatures from 7 K through to 388 K, we obtain spectral profiles require an advanced reaction coordinate model explain [1].We compelling evidence that the single (staggered D5d or eclipsed D5h) used interpret many...
Measurements of mass attenuation coefficients and X-ray absorption fine structure (XAFS) zinc selenide (ZnSe) are reported to accuracies typically better than 0.13%.The high accuracy the results presented here is due our successful implementation Extended Range Technique (XERT), a relatively new methodology, which can be set up on most synchrotron beamlines.561 were recorded in energy range 6.8 keV 15 that was independently calibrated using powder diffractometry, with measurements...