Heavy-Ion Storage Rings

Wolf, A.

doi:10.1007/978-3-642-58580-7_1

Cited by 13 publications

(4 citation statements)

References 61 publications

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“…Although initially developed for experiments in particle physics, during the late 80s and early 90s it was realized that these facilities presented a great opportunity for atomic and molecular physics. Many reviews exist on ion storage rings and the atomic and molecular physics conducted at them and provide an excellent introduction to the technique, for examples (Larsson, 1995(Larsson, , 1997(Larsson, , 2001Müller & Wolf, 1997;Wolf, 1999). The application of storage rings to studies of DR, and also to the other reactions involving ions and electrons, is an extension of the merged beams technique in which two separate beams of ions and electrons are overlapped in a controlled way and the products from any interaction detected and analyzed.…”

Section: B Storage Ring Techniquesmentioning

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: B Storage Ring Techniquesmentioning

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 low transition probability is associated with a long level lifetime (in the millisecond range for the first ions of the isoelectronic sequence), which causes severe problems in regular beam-foil lifetime measurements (that work best in the picosecond to nanosecond range). However, the introduction of storage ring techniques [42] has turned the situation around, and some lifetime measurements on intercombination transitions in low charge Be-like ions are now among the most precise atomic lifetime measurements ever done (see below). Heavyion storage rings can be imagined as beam-foil experiments in which the fast ion beam is being curved into a loop, so that it passes the same detector over and over again.…”

Section: Be-like Ionsmentioning

confidence: 99%

Isoelectronic trends of line strength data in the Li and Be isoelectronic sequences

Curtis

2006

Phys. Scr.

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The decays of the 2p J=1/2 and J=3/2 levels of Li-like ions and of the 2s2p 1,3Po1 levels of Be-like ions can be used as simple-atom test beds for lifetime measurements and for the development of accurate calculations of the transition rates. We have summarized and filtered the experimental data in order to obtain consistent data sets and isoelectronic trends that can be compared to theoretical predictions. The graphical presentation of line strength data enables direct comparison and evaluation of the merit of data along extended isoelectronic sequences. From this, the precision that is necessary in future meaningful experiments can be deduced.

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“…Information on ion storage-ring facilities and electron cooling can be found in the literature (e.g . Poth 1990;Wolf 1999;Wolf et al 2004); storage-ring studies of DR were reviewed by Larsson (1997Larsson ( , 2000.…”

Section: Experimental Approachmentioning

confidence: 99%

Effects of molecular rotation in low-energy electron collisions of

Wolf

Kreckel

Lammich

et al. 2006

Phil. Trans. R. Soc. A.

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Measurements on the energetic structure of the dissociative recombination rate coefficient in the millielectronvolt range are described for H3+ ions produced in the lowest rotational levels by collisional cooling and stored as a fast beam in the magnetic storage ring TSR (Test Storage Ring). The observed resonant structure is consistent with that found previously at the storage ring facility CRYRING in Stockholm, Sweden; theoretical predictions yield good agreement on the overall size of the rate coefficient, but do not reproduce the detailed structure. First studies on the nuclear spin symmetry influencing the lowest level populations show a small effect different from the theoretical predictions. Heating processes in the residual gas and by collisions with energetic electrons, as well as cooling owing to interaction with cold electrons, were observed in long-time storage experiments, using the low-energy dissociative recombination rate coefficient as a probe, and their consistency with the recent cold H3+ measurements is discussed.

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Heavy-Ion Storage Rings

Cited by 13 publications

References 61 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

Isoelectronic trends of line strength data in the Li and Be isoelectronic sequences

Effects of molecular rotation in low-energy electron collisions of

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