Måns Wallner
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View article: Non-ergodic dissociative valence double ionization of SF6
Non-ergodic dissociative valence double ionization of SF6 Open
The dissociative double ionization of sulphur hexafluoride, SF 6 , in the ionization energy range from threshold up to 48.4 eV has been examined in detail using a multiple coincidence electron-ion technique. The results are interpreted by …
View article: Core-valence double ionization of carbon suboxide
Core-valence double ionization of carbon suboxide Open
We have measured the core-valence double ionization spectra of carbon suboxide above both the O 1s and C 1s edges. Following several core-valence cases known in the literature, to begin with the spectra are compared with the well-known sin…
View article: Non-ergodic dissociative valence double ionization of SF6
Non-ergodic dissociative valence double ionization of SF6 Open
The dissociative double ionization of sulphur hexafluoride, SF6, in the ionization energy range from threshold up to 48.4 eV has been examined in detail using a multiple coincidence electron-ion technique. The results are interpreted by co…
View article: Core-valence double ionization of carbon suboxide
Core-valence double ionization of carbon suboxide Open
We have measured the core-valence double ionization spectra of carbon suboxide above both the O 1s and C 1s edges. The spectra are compared with the well-known single ionization valence photoelectron spectrum of this system, from which the…
View article: Anisotropy parameters from shapes of ion-ion correlation features of fragmenting molecules
Anisotropy parameters from shapes of ion-ion correlation features of fragmenting molecules Open
When a molecule loses two electrons, Coulomb repulsion makes the resulting doubly charged system likely to fragment into two singly charged ions. These monocations can be detected in a correlated fashion using multiplex time-of-flight spec…
View article: Structure and fragmentation of doubly ionized HNCS
Structure and fragmentation of doubly ionized HNCS Open
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 ionization energy of HNCS is found …
View article: Anisotropy parameters from two-body dissociations
Anisotropy parameters from two-body dissociations Open
When a molecule loses two electrons, Coulomb repulsion makes the resulting doubly charged system likely to fragment into two singly charged ions. These monocations can be detected in a correlated fashion using multiplex time-of-flight spec…
View article: Doubly ionized OCS bond rearrangement upon fragmentation – experiment and theory
Doubly ionized OCS bond rearrangement upon fragmentation – experiment and theory Open
Using a combined theoretical and experimental approach we shed light on the complex fragmentation dynamics of the OCS dication.
View article: Abiotic molecular oxygen production—Ionic pathway from sulfur dioxide
Abiotic molecular oxygen production—Ionic pathway from sulfur dioxide Open
Molecular oxygen, O 2 , is vital to life on Earth and possibly also on exoplanets. Although the biogenic processes leading to its accumulation in Earth’s atmosphere are well understood, its abiotic origin is still not fully established. He…
View article: Double ionisation of disulfur
Double ionisation of disulfur Open
Using time-of-flight multiple electron and ion coincidence techniques in combination with a helium gas discharge lamp and synchrotron radiation, the double ionisation spectrum of disulfur (S2) and the subsequent fragmentation dynamics of i…
View article: Single photon double and triple ionization of allene
Single photon double and triple ionization of allene Open
Single photon double and triple ionization of allene is investigated using multi-particle coincidence spectroscopies. Key findings comprise supporting evidence for a previously proposed roaming mechanism in H 3 + formation by double ioniza…
View article: Core-Level Spectroscopy of 2-Thiouracil at the Sulfur L1- and L2,3-Edges Utilizing a SASE Free-Electron Laser
Core-Level Spectroscopy of 2-Thiouracil at the Sulfur L1- and L2,3-Edges Utilizing a SASE Free-Electron Laser Open
In this paper, we report X-ray absorption and core-level electron spectra of the nucleobase derivative 2-thiouracil at the sulfur L1- and L2,3-edges. We used soft X-rays from the free-electron laser FLASH2 for the excitation of isolated mo…
View article: Single photon double and triple ionisation of allene
Single photon double and triple ionisation of allene Open
Double and triple ionization of allene are investigated using electron-electron, ion-ion, electron-electron-ion and electron-electron-ion-ion (ee, ii, eei, eeii) coincidence spectroscopies at selected photon energies. The results provide s…
View article: Abiotic molecular oxygen production -- ionic pathway from sulphur dioxide
Abiotic molecular oxygen production -- ionic pathway from sulphur dioxide Open
Molecular oxygen, O$_2$, is vital to life on Earth and possibly on other planets. Although the biogenic processes leading to its accumulation in Earth's atmosphere are well understood, its abiotic origin is still not fully established. Her…
View article: State selective fragmentation of doubly ionized sulphur dioxide
State selective fragmentation of doubly ionized sulphur dioxide Open
Using multi-electron–ion coincidence measurements combined with high level calculations, we show that double ionisation of SO 2 at 40.81 eV can be state selective. It leads to high energy products, in good yield, via a newly identified mec…
View article: State-selection by an Unconventional Mechanism in Dissociative Double Ionization of Sulphur Dioxide
State-selection by an Unconventional Mechanism in Dissociative Double Ionization of Sulphur Dioxide Open
Using multi-electron-ion coincidence measurements combined with high level calculations, we show that double ionization of SO 2 at 40.81 eV can be state selective. It leads to high energy products, in good yield, via a newly identified mec…
View article: Following UV-induced electronic dynamics of thiouracil by ultrafast x-ray photoelectron spectroscopy
Following UV-induced electronic dynamics of thiouracil by ultrafast x-ray photoelectron spectroscopy Open
Photoexcited molecules convert photon energy into other energetic degrees of freedom involving the coupling of ultrafast electronic and nuclear motion. Here, we demonstrate that time-resolved x-ray photoelectron spectroscopy (TR-XPS) offer…
View article: Double and Triple Ionisation of Isocyanic Acid
Double and Triple Ionisation of Isocyanic Acid Open
Double and triple ionisation spectra of the reactive molecule isocyanic acid (HNCO) have been measured using multi-electron and ion coincidence techniques combined with synchrotron radiation and compared with high-level theoretical calcula…
View article: Ultrafast dynamics of 2-thiouracil investigated by time-resolved Auger spectroscopy
Ultrafast dynamics of 2-thiouracil investigated by time-resolved Auger spectroscopy Open
We present time-resolved ultraviolet-pump x-ray probe Auger spectra of 2-thiouracil. An ultraviolet induced shift towards higher kinetic energies is observed in the sulfur 2p Auger decay. The difference Auger spectra of pumped and unpumped…
View article: Double and triple ionization of isocyanic acid
Double and triple ionization of isocyanic acid Open
Double and triple ionization spectra of isocyanic acid have been measured using multi-electron and ion coincidence techniques combined with synchrotron radiation and compared with high-level theoretical calculations. Vertical double ioniza…
View article: Coulomb explosion of CD3I induced by single photon deep inner-shell ionisation
Coulomb explosion of CD3I induced by single photon deep inner-shell ionisation Open
L-shell ionisation and subsequent Coulomb explosion of fully deuterated methyl iodide, CD$_3$I, irradiated with hard x-rays has been examined by a time-of-flight multi-ion coincidence technique. The core vacancies relax efficiently by Auge…
View article: Relative extent of triple Auger decay in CO and CO<sub>2</sub>
Relative extent of triple Auger decay in CO and CO<sub>2</sub> Open
Systematic measurements on single and triple Auger decay in CO and CO2 after the creation of a C 1s or a O 1s core vacancy show that the percentage of triple Auger decay is on the order of 10−2 of the single Auger decay in these molecules.