A. Kivimäki
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View article: In-Flight Observation and Surface Oxidation Modification of Tin Oxide Nanoparticles for Gas Sensing Applications
In-Flight Observation and Surface Oxidation Modification of Tin Oxide Nanoparticles for Gas Sensing Applications Open
Metal oxide nanoparticles are essential in various applications, and the synthesis through gas-phase generation methods offers a rapid and reliable pathway for nanoparticle production. Yet achieving precise control over their formation rem…
View article: Negative-Ion Formation upon Soft X-ray Photoexcitation of 2-Propanol
Negative-Ion Formation upon Soft X-ray Photoexcitation of 2-Propanol Open
This study investigates the formation of negative ion fragments from gas-phase 2-propanol molecules after interaction with soft X-rays near the O K-edge. The experiment was performed by detecting negative and positive ions in coincidence w…
View article: The low-lying electronic states of 4H-pyran-4-thione; a photoionization and vacuum ultraviolet absorption study, with interpretation by configuration interaction and density functional calculations for the ionic and singlet states
The low-lying electronic states of 4H-pyran-4-thione; a photoionization and vacuum ultraviolet absorption study, with interpretation by configuration interaction and density functional calculations for the ionic and singlet states Open
Two synchrotron-based studies on 4H-pyran-4-thione, photoelectron spectroscopy and vacuum ultraviolet (VUV) absorption spectra were performed. A highly resolved structure was observed in the photoelectron spectrum (PES), in contrast to an …
View article: Examining low-intensity surface fires in boreal forests using sentinel-2 time series and bitemporal terrestrial laser scanning
Examining low-intensity surface fires in boreal forests using sentinel-2 time series and bitemporal terrestrial laser scanning Open
Publisher Copyright: © 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
View article: Which Ab Initio Calculation Methods Describe the Charge Transfer in Ionic Liquid Vapors? Case Study on Emim-Otf Reveals the Frontier Orbitals and the Ionization Threshold
Which Ab Initio Calculation Methods Describe the Charge Transfer in Ionic Liquid Vapors? Case Study on Emim-Otf Reveals the Frontier Orbitals and the Ionization Threshold Open
View article: Hydrogen migration reactions <i>via</i> low internal energy pathways in aminobenzoic acid dications
Hydrogen migration reactions <i>via</i> low internal energy pathways in aminobenzoic acid dications Open
Low lying excited states following Auger decay lead to efficient H 3 O + production in ortho -aminobenzoic acid dications via complex hydrogen migrations.
View article: A versatile sample-delivery system for X-ray photoelectron spectroscopy of in-flight aerosols and free nanoparticles at MAX IV Laboratory
A versatile sample-delivery system for X-ray photoelectron spectroscopy of in-flight aerosols and free nanoparticles at MAX IV Laboratory Open
Aerosol science is of utmost importance for both climate and public health research, and in recent years X-ray techniques have proven effective tools for aerosol-particle characterization. To date, such methods have often involved the stud…
View article: Search for the interatomic Auger effect in Nitrous Oxide
Search for the interatomic Auger effect in Nitrous Oxide Open
View article: Forming Bonds While Breaking Old Ones: Isomer-Dependent Formation of H<sub>3</sub>O<sup>+</sup> from Aminobenzoic Acid During X-ray-Induced Fragmentation
Forming Bonds While Breaking Old Ones: Isomer-Dependent Formation of H<sub>3</sub>O<sup>+</sup> from Aminobenzoic Acid During X-ray-Induced Fragmentation Open
Intramolecular hydrogen transfer, a reaction where donor and acceptor sites of a hydrogen atom are part of the same molecule, is a ubiquitous reaction in biochemistry and organic synthesis. In this work, we report hydronium ion (H3
View article: Photodissociation of bromine-substituted nitroimidazole radiosensitizers
Photodissociation of bromine-substituted nitroimidazole radiosensitizers Open
Dicationic dissociation of brominated nitroimidazoles leads to the release of reactive ionic fragments likely related to radiosensitivity.
View article: Energy-dependent timescales in the dissociation of diiodothiophene dication
Energy-dependent timescales in the dissociation of diiodothiophene dication Open
From experimental electron-ion-ion coincidences and simulations, we followed the evolution of three-body fragmentation from secondary towards concerted dissociation as the available energy increased and determined secondary fragmentation t…
View article: Recent advances in time-resolved luminescence spectroscopy at MAX IV and PETRA III storage rings
Recent advances in time-resolved luminescence spectroscopy at MAX IV and PETRA III storage rings Open
Short-wavelength synchrotron radiation excitation has been an indispensable tool in the studies of the properties of wide gap materials using time-resolved low-temperature luminescence spectroscopy. In recent years, several setups for such…
View article: A new user-friendly materials science end station at the FinEstBeAMS beamline of MAX IV
A new user-friendly materials science end station at the FinEstBeAMS beamline of MAX IV Open
FinEstBeAMS is an atmospheric and materials science beamline located at the 1.5 GeV storage ring of the MAX IV Laboratory in Lund, Sweden. It offers a very wide photon energy range 4.5-1300 eV and radiation with different polarization char…
View article: An experimental and theoretical study of the Kr 3d correlation satellites
An experimental and theoretical study of the Kr 3d correlation satellites Open
The Kr 3d correlation satellites have been studied experimentally by using plane polarized synchrotron radiation to record polarization dependent photoelectron spectra (PES), and theoretically by employing the R-matrix method to calculate …
View article: Ion fragmentation study of [EMMIM][TFSI], [EMIM][OTf] and [EMIM][DCA] by vacuum ultraviolet light
Ion fragmentation study of [EMMIM][TFSI], [EMIM][OTf] and [EMIM][DCA] by vacuum ultraviolet light Open
View article: Valence shell photoelectron angular distributions and vibrationally resolved spectra of imidazole: A combined experimental–theoretical study
Valence shell photoelectron angular distributions and vibrationally resolved spectra of imidazole: A combined experimental–theoretical study Open
Linearly polarized synchrotron radiation has been used to record polarization dependent valence shell photoelectron spectra of imidazole in the photon energy range 21–100 eV. These have allowed the photoelectron angular distributions, as c…
View article: Performance and characterization of the FinEstBeAMS beamline at the MAX IV Laboratory
Performance and characterization of the FinEstBeAMS beamline at the MAX IV Laboratory Open
FinEstBeAMS (Finnish–Estonian Beamline for Atmospheric and Materials Sciences) is a multidisciplinary beamline constructed at the 1.5 GeV storage ring of the MAX IV synchrotron facility in Lund, Sweden. The beamline covers an extremely wid…
View article: Core and Valence Level Photoelectron Spectroscopy of Nanosolvated KCl
Core and Valence Level Photoelectron Spectroscopy of Nanosolvated KCl Open
The solvation of alkali and halide ions in the aqueous environment has been a subject of intense experimental and theoretical research with multidisciplinary interests; yet, a comprehensive molecular-level understanding has still not been …
View article: Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule
Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule Open
Dissociation of water molecules after soft X-ray absorption can yield neutral fragments in high-Rydberg (HR) states. We have studied the production of such fragments by field ionization and ion time-of-flight (TOF) spectrometry. Neutral HR…
View article: A competition between two- and three-body dissociation channels in photo-double-ionization of tetrahydro-2H-pyran and 3,4-dihydro-2H-pyran molecules
A competition between two- and three-body dissociation channels in photo-double-ionization of tetrahydro-2H-pyran and 3,4-dihydro-2H-pyran molecules Open
Anna A. Oleshkevich, Specific features of change in enzymate activity in
View article: Electron–ion coincidence spectroscopy of a large organic molecule: photofragmentation of avobenzone after valence and core ionisation
Electron–ion coincidence spectroscopy of a large organic molecule: photofragmentation of avobenzone after valence and core ionisation Open
The Avobenzone (AVOB) molecule is very photoactive and undergoes irreversible degradation upon irradiation. We studied its valence and core-level (C1 s and O1 s ) photoionisation and subsequent photofragmentation with photoelectron spectro…
View article: Gas-phase endstation of electron, ion and coincidence spectroscopies for diluted samples at the FinEstBeAMS beamline of the MAX IV 1.5 GeV storage ring
Gas-phase endstation of electron, ion and coincidence spectroscopies for diluted samples at the FinEstBeAMS beamline of the MAX IV 1.5 GeV storage ring Open
Since spring 2019 an experimental setup consisting of an electron spectrometer and an ion time-of-flight mass spectrometer for diluted samples has been available for users at the FinEstBeAMS beamline of the MAX IV Laboratory in Lund, Swede…
View article: Vacuum ultraviolet photoionization and ionic fragmentation of the isoxazole molecules
Vacuum ultraviolet photoionization and ionic fragmentation of the isoxazole molecules Open
View article: The electronic structure of ionic liquids based on the TFSI anion: A gas phase UPS and DFT study
The electronic structure of ionic liquids based on the TFSI anion: A gas phase UPS and DFT study Open
View article: Progress in development of a new luminescence setup at the FinEstBeAMS beamline of the MAX IV laboratory
Progress in development of a new luminescence setup at the FinEstBeAMS beamline of the MAX IV laboratory Open
View article: Selective negative-ion formation from core-valence doubly excited states of the water molecule
Selective negative-ion formation from core-valence doubly excited states of the water molecule Open
This study focuses on the role of negative-ion formation in the decay of core-valence doubly excited water molecules. Combining negative- and positive-ion coincidence measurements with calculated energies of core-valence doubly excited sta…
View article: Study of ultraviolet-visible fluorescence emission following resonant Auger decay of the 2 p -1 nl core-excited states of argon atoms
Study of ultraviolet-visible fluorescence emission following resonant Auger decay of the 2 p -1 nl core-excited states of argon atoms Open
View article: Acetylacetone photodynamics at a seeded free-electron laser
Acetylacetone photodynamics at a seeded free-electron laser Open
View article: Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments
Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments Open
We have studied the fragmentation of the methanol molecule after core excitation and core ionization by observing coincidences between negative and positive ions. Five different negative ions (H-, C-, CH-, …
View article: Negative- and positive-ion fragmentation of core-excited formic-acid molecules studied with three- and four-ion coincidence spectroscopy
Negative- and positive-ion fragmentation of core-excited formic-acid molecules studied with three- and four-ion coincidence spectroscopy Open
The negative-ion fragmentation of formic acid (HCOOH) is studied with negative- and positive-ion coincidence spectroscopy. We report four-body ionic fragmentation where up to three positive ions are collected in coincidence with one negati…