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Rotationally Cold OH- Ions in the Cryogenic Electrostatic Ion-Beam Storage Ring DESIREE
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 17
2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 7, 073001Article in journal (Refereed) Published
Abstract [en]

We apply near-threshold laser photodetachment to characterize the rotational quantum level distribution of OH- ions stored in the cryogenic ion-beam storage ring DESIREE at Stockholm University. We find that the stored ions relax to a rotational temperature of 13.4 +/- 0.2 K with 94.9 +/- 0.3% of the ions in the rotational ground state. This is consistent with the storage ring temperature of 13.5 +/- 0.5 K as measured with eight silicon diodes but in contrast to all earlier studies in cryogenic traps and rings where the rotational temperatures were always much higher than those of the storage devices at their lowest temperatures. Furthermore, we actively modify the rotational distribution through selective photodetachment to produce an OH- beam where 99.1 +/- 0.1% of approximately one million stored ions are in the J = 0 rotational ground state. We measure the intrinsic lifetime of the J = 1 rotational level to be 145 +/- 28 s.

Place, publisher, year, edition, pages
2017. Vol. 119, no 7, 073001
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-147089DOI: 10.1103/PhysRevLett.119.073001ISI: 000407557300003OAI: oai:DiVA.org:su-147089DiVA: diva2:1149437
Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-10-16Bibliographically approved

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Schmidt, Henning T.Eklund, GustavChartkunchand, Kiattichart C.Anderson, Emma K.Kamińska, Magdalenade Ruette, NathalieThomas, Richard D.Kristiansson, Moa K.Gatchell, MichaelReinhed, PeterRosen, StefanSimonsson, AnsgarKällberg, AndersLöfgren, PatrikMannervik, SvenZettergren, HenningCederquist, Henrik
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