A5042362725- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Analytical chemistry methods development
- Laser-Matter Interactions and Applications
- Water Quality Monitoring and Analysis
- Atmospheric and Environmental Gas Dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Photoreceptor and optogenetics research
- Cold Atom Physics and Bose-Einstein Condensates
- Spectroscopy and Quantum Chemical Studies
- Analytical Chemistry and Sensors
- Advanced NMR Techniques and Applications
- Quantum Dots Synthesis And Properties
- Nuclear physics research studies
- Catalytic Processes in Materials Science
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Ion-surface interactions and analysis
- Crystallography and Radiation Phenomena
- Luminescence Properties of Advanced Materials
University of Gothenburg
2021-2025
Origo (Iceland)
2022
<title>Abstract</title> The dissociative double ionization of sulphur hexafluoride, SF<sub>6</sub>, in the energy range from threshold up to 48.4 eV has been examined detail using a multiple coincidence electron-ion technique. results are interpreted by comparison with molecular dynamics simulations, high level structure calculations and statistical model ion breakdown. Comparison between experimental breakdown pattern derived on basis theory indicates that redistribution required for fully...
Abstract Single photon double ionization of carbon diselenide ( $${\hbox {CSe}}_{2}$$ ) has been investigated by means multi-particle coincidence techniques. The interpretation the experimental spectra is helped post-Hartree-Fock computations at Coupled Clusters and Multi-Reference Configuration-Interaction levels to determine energetics electronic state potentials $$\hbox {CSe}_2^{2+}$$ its fragments. lowest energy found be 24.68 ± 0.20 eV, reflecting { X} ^3\Sigma ^-_g$$ ground state, in...
<title>Abstract</title> We have measured the core-valence double ionization spectra of carbon suboxide above both O 1s and C edges. The are compared with well-known single valence photoelectron spectrum this system, from which they differ quite strongly. Auger decay following hole formation at chemically distinct central outer atoms shows strong selectivity in final multiply charged states produced. Assignment spectral features is made by comparing calculations sudden approximation assuming...
Abstract We have measured the core-valence double ionization spectra of carbon suboxide above both O 1s and C edges. Following several cases known in literature, to begin with are compared well-known single valence photoelectron spectrum this system, from which they surprisingly differ quite strongly. This motivates a comparison electronic structure calculations carried out within sudden approximation where overlap between core orbital is included, while still assuming decoupling events. The...
Double ionization spectra of isothiocyanic acid (HNCS) have been measured using multi-electron and multi-ion coincidence techniques combined with high-level theoretical calculations. The adiabatic double energy HNCS is found at 27.1 ± 0.1 eV associated the formation X 3A″ ground state HNCS2+. characteristics different dissociation channels are examined compared to results electronic structure calculations obtained by systematically elongating three bonds H-NCS, HN-CS, HNC-S. For instance,...
Molecular oxygen, O 2 , is vital to life on Earth and possibly also exoplanets. Although the biogenic processes leading its accumulation in Earth’s atmosphere are well understood, abiotic origin still not fully established. Here, we report combined experimental theoretical evidence for electronic state–selective production of from SO a chemical constituent many planetary atmospheres one that played an important part Great Oxidation Event. The involves dissociative double ionization efficient...
The properties of atomic negative ions are to a large extent determined by electron-electron correlation which makes them an ideal testing ground for many-body physics. In this paper, we present detailed experimental and theoretical study excited states in the ion iridium. were stored at cryogenic temperatures using double electrostatic ring experiment facility Stockholm University. Laser photodetachment was used monitor relaxation three bound belonging [Xe] $4{f}^{14}5{d}^{8}6{s}^{2}$ ionic...
Double and triple ionization of allene are investigated using electron-electron, ion-ion, electron-electron-ion electron-electron-ion-ion (ee, ii, eei, eeii) coincidence spectroscopies at selected photon energies. The results provide supporting evidence for a previously proposed roaming mechanism in H3+ formation by double ionization. lowest vertical energy is found to be 27.9 eV, while adiabatic not accessed the neutral geometry. close 50 eV agreement with theoretical predictions. doubly...
The dissociation of OCS2+ ions formed by photoionization the neutral molecule at 40.81 eV is examined using threefold and fourfold electron-ion coincidence spectroscopy combined with high level quantum chemical calculations on isomeric structures their potential energy surfaces. dominant channel [OCS]2+ charge separation forming CO+ + S+ ion pairs, found here to be low intensity a lower-energy onset correspondingly smaller kinetic release than in more intense higher previously reported. We...
Conventional electron spectroscopy is an established one-electron-at-the-time method for revealing the electronic structure and dynamics of either valence or inner shell ionized systems. By combining electron-electron coincidence technique with use soft X-radiation we have measured a double ionisation spectrum allene molecule in which one removed from C1s core orbital orbital, well beyond Siegbahns Electron-Spectroscopy-for-Chemical-Analysis method. This core-valence shows effect symmetry...
<title>Abstract</title> When a molecule loses two electrons, Coulomb repulsion makes the resulting doubly charged system likely to fragment into singly ions. These monocations can be detected in correlated fashion using multiplex time-of-flight spectroscopy. The island shapes ion-ion coincidence maps derived from such two-body dissociations contain detailed information on physical processes underlying fragmentation. Here, simple method is presented where fit function used determine...
Abstract When a molecule loses two electrons, Coulomb repulsion makes the resulting doubly charged system likely to fragment into singly ions. These monocations can be detected in correlated fashion using multiplex time-of-flight spectroscopy. The island shapes ion-ion coincidence maps derived from such two-body dissociations contain detailed information on physical processes underlying fragmentation. Here, simple method is presented where fit function used determine anisotropy parameter β...
Abstract Using time-of-flight multiple electron and ion coincidence techniques in combination with a helium gas discharge lamp synchrotron radiation, the double ionisation spectrum of disulfur (S2) subsequent fragmentation dynamics its dication are investigated. The S2 sample was produced by heating mercury sulfide (HgS), whose vapour at suitably chosen temperature consists primarily two constituents: atomic Hg. A multi-particle-coincidence technique is thus particularly useful for...
Using time-of-flight multiple electron and ion coincidence techniques in combination with a helium gas discharge lamp synchrotron radiation, the double ionisation spectrum of disulfur (S[Formula: see text]) subsequent fragmentation dynamics its dication are investigated. The S[Formula: text] sample was produced by heating mercury sulfide (HgS), whose vapour at suitably chosen temperature consists primarily two constituents: atomic Hg. A multi-particle-coincidence technique is thus...
Double and triple ionization of allene are investigated using electron-electron, ion-ion, electron-electron-ion electron-electron-ion-ion (ee, ii, eei, eeii) coincidence spectroscopies at selected photon energies. The results provide supporting evidence for a previously proposed roaming mechanism in H$_3^+$ formation by double ionisation. lowest vertical energy is found to be 28.5 eV, while adiabatic ionisation not accessed the neutral geometry. close 50 eV agreement with theoretical...
Molecular oxygen, O$_2$, is vital to life on Earth and possibly other planets. Although the biogenic processes leading its accumulation in Earth's atmosphere are well understood, abiotic origin still not fully established. Here, we report combined experimental theoretical evidence for electronic-state-selective production of O$_2$ from SO$_2$, a major chemical constituent many planetary atmospheres one which played an important part Great Oxidation event. The involves dissociative double...