Pulsed injection of ions into the CRESU experiment

Speck, Thomas; Mostefaoui, T; Travers, D.; Rowe, B. R.

doi:10.1016/s1387-3806(01)00383-9

Cited by 10 publications

(9 citation statements)

References 29 publications

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“…References [15,16], studying charge exchange at E $ 100 meV, report the only observations of Langevin-type ion-atom collisions. In ion-molecule systems, experimental signatures of Langevin collisions have been seen at high temperature [17][18][19], and recently also at 1 K (80 eV) [20]. In all previous work, at most one of the collision partners was trapped.…”

mentioning

confidence: 93%

Observation of Cold Collisions between Trapped Ions and Trapped Atoms

et al. 2009

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We study cold collisions between trapped ions and trapped atoms in the semiclassical (Langevin) regime. Using Yb+ ions confined in a Paul trap and Yb atoms in a magneto-optical trap, we investigate charge-exchange collisions of several isotopes over three decades of collision energies down to 3 mueV (k_{B}x35 mK). The minimum measured rate coefficient of 6x10;{-10} cm;{3} s;{-1} is in good agreement with that derived from a Langevin model for an atomic polarizability of 143 a.u.

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confidence: 93%

Observation of Cold Collisions between Trapped Ions and Trapped Atoms

et al. 2009

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“…In 1993 part of this apparatus was moved to the University of Rennes 1 where it was rebuilt and adapted to the use of slightly higher pressures. In addition, a pulsed ion source [54] was further developed, allowing the injection of ions into the flow by drifting them in electric fields and avoiding the presence of parent neutrals, as well as a variety of excited species initially present in the flow with the electron beam technique. By pulsing the drifting field, ions penetrated the core of the flow where they could cool down to the flow temperature prior to reaction, thereby avoiding the field heating problem common in drift techniques [47,54].…”

Section: Ion-molecule Reactionsmentioning

confidence: 99%

“…With respect to ion-molecule reactions, the development of pulsed supersonic flows in Rennes will offer the possibility of achieving very low pressures in the supersonic flow due to the high pumping speed available (∼ 30 000 m3/h) and therefore will open the way to a revival of the original ion-molecule CRESU apparatus by the use of a selective injection of ions which will be directly derived from expertise gained previously [53,54]. Studies involving expensive deuterated species could also be of great interest.…”

Section: Charges Speciesmentioning

confidence: 99%

Gas phase reactive collisions, experimental approach

Canosa

2011

EPJ Web of Conferences

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Abstract. Since 1937 when the first molecule in space has been identified, more than 150 molecules have been detected. Understanding the fate of these molecules requires having a perfect view of their photochemistry and reactivity with other partners. It is then crucial to identify the main processes that will produce and destroy them. In this chapter, a general view of experimental techniques able to deliver gas phase chemical kinetics data at low and very low temperatures will be presented. These techniques apply to the study of reactions between neutral reactants on the one hand and reactions involving charge species on the other hand.

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“…By pulsing the drifting field, ions penetrated the core of the flow where they could cool down to the flow temperature prior to reaction, thereby avoiding the field heating problem common in drift techniques. 22,37 Subsequently it was realised that this apparatus could be used for studies of electron attachment. The electron beam creates a plasma with a moderate level of ionisation (10 8 to 10 9 electrons cm −3 ).…”

Section: Reaction Kinetics Involving Charged Speciesmentioning

confidence: 99%

“…36,37 Studies at temperatures close to 1 K will be a decisive test in comparing present collision theories and are obviously of major importance.…”

Section: Charged Speciesmentioning

confidence: 99%