Christian Stråhlman
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View article: Orientational anisotropy of photoemitting CS<sub>2</sub> molecules induced by molecular field splitting
Orientational anisotropy of photoemitting CS<sub>2</sub> molecules induced by molecular field splitting Open
We recorded the sulfur 2 p photoelectron spectrum from gas-phase CS 2 molecules, in coincidence with the ionic fragments S + , S 2+ and CS + . The fragments are created by the dissociation of the parent molecular dication following the Aug…
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: 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: Non-radiative decay and fragmentation in water molecules after 1a1−14a1 excitation and core ionization studied by electron-energy-resolved electron–ion coincidence spectroscopy
Non-radiative decay and fragmentation in water molecules after 1a1−14a1 excitation and core ionization studied by electron-energy-resolved electron–ion coincidence spectroscopy Open
In this paper, we examine decay and fragmentation of core-excited and core-ionized water molecules combining quantum chemical calculations and electron-energy-resolved electron–ion coincidence spectroscopy. The experimental technique allow…
View article: Measuring the atomic spin-flip scattering rate by x-ray emission spectroscopy
Measuring the atomic spin-flip scattering rate by x-ray emission spectroscopy 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: 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…
View article: Capabilities of Angle Resolved Time of Flight electron spectroscopy with the 60° wide angle acceptance lens
Capabilities of Angle Resolved Time of Flight electron spectroscopy with the 60° wide angle acceptance lens Open
The simultaneous detection of energy, momentum and temporal information in electron spectroscopy is the key aspect to enhance the detection efficiency in order to broaden the range of scientific applications. Employing a novel 60 degrees w…
View article: Dissociation of cyclopropane in double ionization continuum
Dissociation of cyclopropane in double ionization continuum Open
The Jahn–Teller instability of cyclopropane contributes to dissociative double ionization processes.
View article: Time-of-Flight Ion and Electron Spectroscopy: Applications and Challenges at Storage Ring Light Sources
Time-of-Flight Ion and Electron Spectroscopy: Applications and Challenges at Storage Ring Light Sources Open
This dissertation contains seven studies exploring novel instrumentation for ion and electron spectroscopy, including their applicability at storage ring light sources. The studies focus on instrumentation to study decay, dynamics and diss…
View article: A tandem time–of–flight spectrometer for negative–ion/positive–ion coincidence measurements with soft x-ray excitation
A tandem time–of–flight spectrometer for negative–ion/positive–ion coincidence measurements with soft x-ray excitation Open
We present a newly constructed spectrometer for negative–ion/positive–ion coincidence spectroscopy of gaseous samples. The instrument consists of two time–of–flight ion spectrometers and a magnetic momentum filter for deflection of electro…
View article: Preparing the MAX IV storage rings for timing-based experiments
Preparing the MAX IV storage rings for timing-based experiments Open
Time-resolved experimental techniques are increasingly abundant at storage ring facilities. Recent developments in accelerator technology and beamline instrumentation allow for simultaneous operation of high-intensity and timing-based expe…
View article: Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule
Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule Open
We have studied the production of neutral high-Rydberg (HR) fragments from the CH4 molecule at the C 1s → 3p excitation and at the C 1s ionization threshold. Neutral fragments in HR states were ionized using a pulsed electric field and the…
View article: Synchrotron excitation - field ionization studies of high-Rydberg fragments produced after inner-shell ionization of small molecules
Synchrotron excitation - field ionization studies of high-Rydberg fragments produced after inner-shell ionization of small molecules Open
We have studied the production of neutral high-Rydberg (HR) fragments in small molecules after inner-shell excitation and ionization. Such fragments were ionized using a pulsed electric field and resulting ions were mass-analyzed with an i…
View article: Negative-ion/positive-ion coincidence spectroscopy with a novel spectrometer
Negative-ion/positive-ion coincidence spectroscopy with a novel spectrometer Open
A novel instrument for negative-ion/positive-ion coincidence spectroscopy (NIPICO) is presented. The instrument consists of a double TOF spectrometer with a common extraction region. Electrons are deflected by means of a magnetic field. We…