DESIREE — A Double Electrostatic Storage Ring for Merged-Beam Experiments

Danared, H.; Liljeby, L.; Andler, G.; Bagge, L.; Blom, Mikael; Källberg, A.; Leontein, S.; Löfgren, Patrik; Paál, A.; Rensfelt, K.‐G.; Simonsson, Ansgar; Schmidt, H. T.; Cederquist, H.; Larsson, Mats; Rosén, Stefan; Schmidt, K.

doi:10.1063/1.2190153

Cited by 10 publications

(3 citation statements)

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“…Two of the most recently funded electrostatic storage rings have taken different directions in their planned use. The first of these, Double ElectroStatic Ion Ring ExperimEnt, DESIREE (Rensfelt et al, 2004;Danared et al, 2006;Löfgren et al, 2006;Desiree, 2008), is planned for construction at Stockholm University, Sweden, and the second of these, Cryogenic Storage Ring (CSR) (von Hahn et al, 2004;Zajfman et al, 2005;Fadil et al, 2006;Wolf et al, 2006), is planned for construction at the Max Plank Institute for Nuclear Physics, Heidelberg, Germany. A schematic of the final design of DESIREE is shown in Figure 21.…”

Section: What the Future Holdsmentioning

confidence: 99%

When electrons meet molecular ions and what happens next: Dissociative recombination from interstellar molecular clouds to internal combustion engines

Thomas

2008

Mass Spectrometry Reviews

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The interaction of matter with its environment is the driving force behind the evolution of 99% of the observed matter in the universe. The majority of the visible universe exists in a state of weak ionization, the so called fourth state of matter: plasma. Plasmas are ubiquitous, from those occurring naturally; interstellar molecular clouds, cometary comae, circumstellar shells, to those which are anthropic in origin; flames, combustion engines and fusion reactors. The evolution of these plasmas is driven by the interaction of the plasma constituents, the ions, and the electrons. One of the most important subsets of these reactions is electron-molecular ion recombination. This process is significant for two very important reasons. It is an ionization reducing reaction, removing two ionised species and producing neutral products. Furthermore, these products may themselves be reactive radical species which can then further drive the evolution of the plasma. The rate at which the electron reacts with the ion depends on many parameters, for examples the collision energy, the internal energy of the ion, and the structure of the ion itself. Measuring these properties together with the manner in which the system breaks up is therefore critical if the evolution of the environment is to be understood at all. Several techniques have been developed to study just such reactions to obtain the necessary information on the parameters. In this paper the focus will be on one the most recently developed of these, the Ion Storage Ring, together with the detection tools and techniques used to extract the necessary information from the reaction.

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Section: What the Future Holdsmentioning

confidence: 99%

When electrons meet molecular ions and what happens next: Dissociative recombination from interstellar molecular clouds to internal combustion engines

Thomas

2008

Mass Spectrometry Reviews

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“…This greatly reduces the heat radiation towards the cold inner vacuum chamber. With this combination of storage at cryogenic temperature and the merged-beams technique, we will for the first time have full control of both intra- and inter-molecular degrees of freedom in experiments on interacting molecular ions (Rensfelt et al 2004; Danared et al 2006; Löfgren et al 2006). For infrared non-active molecular ions, buffer gas cooling in cryogenically cooled radiofrequency pre-traps will be applied prior to injection into DESIREE.…”

Section: The Desiree Projectmentioning

confidence: 99%

DESIREE as a new tool for interstellar ion chemistry

Schmidt

Johansson

Thomas

et al. 2008

International Journal of Astrobiology

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A novel cryogenic electrostatic storage device consisting of two ion-beam storage rings with a common straight section for studies of interactions between oppositely charged ions at low and well-defined relative velocities is under construction at Stockholm University. Here we consider the prospect of using this new tool to measure cross-sections and rate coefficients for mutual neutralization reactions of importance in interstellar ion chemistry in general and specifically in cosmic pre-biotic ion chemistry.

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“…As an example, O'Malley and Beck [14] used a relativistic configuration interaction method to predict the lifetimes of the 3p D , P . Experimental determination of these lifetimes is a challenge, but recently, advances have been made by using electrostatic storage rings [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The structure and radiative lifetimes of negative ions homologous to N⁻

Yao

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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Negative ions homologous to N− are interesting systems, since there are several bound terms within the ground configuration. The forbidden transitions between them, often dominated by the magnetic dipole contributions, are affected by term mixing—a relativistic effect. When increasing the nuclear charge in the homologous sequence of negative ions, this effect increases. In this paper we use systematic multiconfiguration Dirac–Hartree–Fock calculations to study these effects and predict affinities, level splittings and transition rates between bound states of N−, P−, As−, Sb− and Bi−. By monitoring the line strengths we are able to predict the deviation from the non-relativistic LS-coupled values for transitions between levels of the lowest 3P term. For Sb− the 1D term is also bound, and the prediction for the rates of its transition to the 3P-levels is a challenge for theory. For Bi− less is known experimentally and we analyze its structure and the relativistic contributions to it.

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DESIREE — A Double Electrostatic Storage Ring for Merged-Beam Experiments

Cited by 10 publications

References 0 publications

When electrons meet molecular ions and what happens next: Dissociative recombination from interstellar molecular clouds to internal combustion engines

When electrons meet molecular ions and what happens next: Dissociative recombination from interstellar molecular clouds to internal combustion engines

DESIREE as a new tool for interstellar ion chemistry

The structure and radiative lifetimes of negative ions homologous to N⁻

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DESIREE — A Double Electrostatic Storage Ring for Merged-Beam Experiments

Cited by 10 publications

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When electrons meet molecular ions and what happens next: Dissociative recombination from interstellar molecular clouds to internal combustion engines

When electrons meet molecular ions and what happens next: Dissociative recombination from interstellar molecular clouds to internal combustion engines

DESIREE as a new tool for interstellar ion chemistry

The structure and radiative lifetimes of negative ions homologous to N−

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Product

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The structure and radiative lifetimes of negative ions homologous to N⁻