A. Simonsson
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View article: Elucidating the role of a molecular anion in mutual neutralisation reactions
Elucidating the role of a molecular anion in mutual neutralisation reactions Open
We have studied the MN of NO+ with NO2- under single-collision conditions at a collision energy of ≈0.1 eV. Combining cryogenically stored-and-merged ion beams with coincident-product imaging, we determine that the reaction predominantly p…
View article: Stability of C<sub>59</sub> Knockout Fragments from Femtoseconds to Infinity
Stability of C<sub>59</sub> Knockout Fragments from Femtoseconds to Infinity Open
We have studied the stability of C 59 anions as a function of time, from their formation on femtosecond timescales to their stabilization on second timescales and beyond, using a combination of theory and experiments. The fragments…
View article: Lifetimes of excited states in P-, As- and Sb-
Lifetimes of excited states in P-, As- and Sb- Open
Radiative lifetimes of three elements of the nitrogen group have been experimentally investigated at the Double ElectroStatic Ion Ring Experiment (DESIREE) facility at Stockholm University. The experiments were performed through selective …
View article: Precision measurements on Si-
Precision measurements on Si- Open
High-precision measurements of the electron affinities (EA) of the three stable isotopes of silicon, $^{28}$Si, $^{29}$Si and $^{30}$Si, have been performed at the cryogenic electrostatic ion-beam storage ring DESIREE. The quantum states o…
View article: Stability of C$_{59}$ Knockout Fragments from Femtoseconds to Infinity
Stability of C$_{59}$ Knockout Fragments from Femtoseconds to Infinity Open
We have studied the stability of C$_{59}$ anions as a function of time, from their formation on femtosecond timescales to their stabilization on second timescales and beyond, using a combination of theory and experiments. The C$_{59}^-$ fr…
View article: Further Measurements of Beam-Beam Interactions in a Gear-Changing System in DESIREE
Further Measurements of Beam-Beam Interactions in a Gear-Changing System in DESIREE Open
In this work we detail experiments performed on a gear-changing system using the Double ElectroStatic Ion Ring ExpEriment (DESIREE). A gear-changing system is one where there are different harmonic numbers in each ring. This experiment use…
View article: Survival of polycyclic aromatic hydrocarbon knockout fragments in the interstellar medium
Survival of polycyclic aromatic hydrocarbon knockout fragments in the interstellar medium Open
Laboratory studies play a crucial role in understanding the chemical nature of the interstellar medium (ISM), but the disconnect between experimental timescales and the timescales of reactions in space can make a direct comparison between …
View article: Measurements of Beam-Beam Interactions in Gear-Changing Collisions in DESIREE
Measurements of Beam-Beam Interactions in Gear-Changing Collisions in DESIREE Open
In this work, we perform measurements on the interactions of colliding beams in a gear-changing system. Gear-changing was first demonstrated in DESIREE in May of 2020 and showed several promising avenues to measure beam-beam effects. DESIR…
View article: Mutual neutralisation of O<sup>+</sup> with O<sup>−</sup>: investigation of the role of metastable ions in a combined experimental and theoretical study
Mutual neutralisation of O<sup>+</sup> with O<sup>−</sup>: investigation of the role of metastable ions in a combined experimental and theoretical study Open
The mutual neutralisation of O + with O − has been studied in a double ion-beam storage ring with combined merged-beams, imaging and timing techniques.
View article: Negative ion relaxation and reactions in a cryogenic storage ring
Negative ion relaxation and reactions in a cryogenic storage ring Open
An overview of recent experimental results of studies of negative atomic and molecular ions in the Double ElectroStatic Ion-Ring ExpEriment, DESIREE is given. Metastable level lifetimes in atomic negative ions have been measured by time-de…
View article: Two-Beam Operation in DESIREE
Two-Beam Operation in DESIREE Open
The current status of DESIREE is described, with special emphasis on the setup for collision experiments with ions in both the two electrostatic rings - negative ions in one ring and positive in the other. By measuring the kinetic energy r…
View article: A Massive Open Online Course On Particle Accelerators
A Massive Open Online Course On Particle Accelerators Open
The TIARA (Test Infrastructure and Accelerator Research Area) project funded by the European Union 7th framework programme made a survey of provision of education and training in accelerator science in Europe. This survey highlighted the n…
View article: A Massive Open Online Course on Particle Accelerators
A Massive Open Online Course on Particle Accelerators Open
The TIARA (Test Infrastructure and Accelerator Research Area) project funded by the European Union 7th framework programme made a survey of provision of education and training in accelerator science in Europe highlighted the need for more …
View article: Rotationally cold (<i>></i> 99% <i>J</i> = 0) OH<i> <sup>−</sup> </i> molecular ions in a cryogenic storage ring
Rotationally cold (<i>></i> 99% <i>J</i> = 0) OH<i> <sup>−</sup> </i> molecular ions in a cryogenic storage ring Open
We store a 10 keV OH− ion-beam at 13.5 ± 0.5 K in one of the DESIREE storage rings. Using photodetachment thermometry we measure the effective relative photodetachment cross section at different storage times and determine the rotational t…
View article: Lifetimes of bound excited states of Pt<sup>−</sup>
Lifetimes of bound excited states of Pt<sup>−</sup> Open
Measurements of the radiative lifetimes of the two excited states of the platinum anion Pt− are presented. Pt− ions stored in the cryogenic ion storage ring DESIREE were photodetached at different photon wavelengths and the resulting yield…
View article: Status of DESIREE
Status of DESIREE Open
DESIREE, the double electrostatic storage rings in Stockholm has been running since 2011(?). In the cold (13 K) environment with an excellent vacuum, very long storage times in both rings have been achieved, which has enabled the preparati…
View article: Instrumentation in DESIREE
Instrumentation in DESIREE Open
The use of the instrumentation in the cryogenic double electrostatic storage rings DESIREE is discussed. In particular measurements of the stored beam currents using either a fast kick-out of the beam or Schottky noise signals are presente…