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Dianion diagnostics in DESIREE: High-sensitivity detection of C-n(2-) from a sputter ion source
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: 172018 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 89, no 3, article id 033112Article in journal (Refereed) Published
Abstract [en]

A sputter ion source with a solid graphite target has been used to produce dianions with a focus on carbon cluster dianions, C-n(2-), with n = 7-24. Singly and doubly charged anions from the source were accelerated together to kinetic energies of 10 keV per atomic unit of charge and injected into one of the cryogenic (13 K) ion-beam storage rings of the Double ElectroStatic Ion Ring Experiment facility at Stockholm University. Spontaneous decay of internally hot C-n(2-) dianions injected into the ring yielded C-n(2-) anions with kinetic energies of 20 keV, which were counted with a microchannel plate detector. Mass spectra produced by scanning the magnetic field of a 90 degrees analyzing magnet on the ion injection line reflect the production of internally hot C-7(2-) - C-24(2-) dianions with lifetimes in the range of tens of microseconds to milliseconds. In spite of the high sensitivity of this method, no conclusive evidence of C-6(2-) was found while there was a clear C-7(2-) signal with the expected isotopic distribution. This is consistent with earlier experimental studies and with theoretical predictions. An upper limit is deduced for a C-6(2-) signal that is two orders-of-magnitude smaller than that for C-7(2-). In addition, CnO2- and CnCu2- dianions were detected.

Place, publisher, year, edition, pages
2018. Vol. 89, no 3, article id 033112
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-155975DOI: 10.1063/1.5010077ISI: 000428988300013PubMedID: 29604753OAI: oai:DiVA.org:su-155975DiVA, id: diva2:1206011
Available from: 2018-05-15 Created: 2018-05-15 Last updated: 2019-12-04Bibliographically approved
In thesis
1. DESIREE: Instrumentation Developments and Hot Metal Cluster Decays
Open this publication in new window or tab >>DESIREE: Instrumentation Developments and Hot Metal Cluster Decays
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents instrumentation developments and measurements performed at the Double ElectroStatic Ion Ring ExpEriment, DESIREE, at Stockholm University. DESIREE operates at cryogenic temperatures ~13 K, with very low background pressures of ~10-14mbar, allowing the observation of stored ions to long times of tens of seconds and longer.

Investigations into improving the count rate capability of the DESIREE detectors are presented. Microchannel plate (MCP) detectors are used for position sensitive particle counting in the DESIREE detector assemblies. In a cryogenic environment the operational resistance of MCPs is orders of magnitude higher than at room temperature and this limits the possible count rates. Novel low-resistance MCP detectors were investigated and resulted in the replacement of the MCPs in the DESIREE detector assemblies.

DESIREE was used to measure spontaneous decays of hot, small cluster anions. The decays of small silver, copper and gold cluster anions are presented and compared to statistical model calculations. An experiment that is able to measure the proportion of spontaneous decay due to fragmentation or electron detachment in dimer anions of silver and copper is presented and significant, previously overlooked, contributions from electron detachment to the decay is identified. Furthermore, measurements of the stability and decay of small carbon cluster dianions are presented. These experiments utilised the aforementioned low-resistance MCPs.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2019. p. 84
Keywords
DESIREE, microchannel plate, clusters, spontaneous decay, small metal cluster anions, silver, copper, gold, carbon dianions, fragmentation, vibrational autodetachment, DESIREE, mikrokanalplattor, kluster, spontana sönderfall, små metallklusteranjoner, silver, koppar, guld, kol di-anjoner, fragmentering
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-167321 (URN)978-91-7797-634-9 (ISBN)978-91-7797-635-6 (ISBN)
Public defence
2019-05-10, FP41, hus 1, AlbaNova universitetscentrum, Roslagstullbacken 21, Stockholm, 13:00 (English)
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Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Manuscript.

Available from: 2019-04-15 Created: 2019-03-25 Last updated: 2019-05-03Bibliographically approved

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Chartkunchand, Kiattichart C.Stockett, Mark H.Anderson, Emma K.Eklund, GustavKristiansson, Moa K.Kamińska, Magdalenade Ruette, NathalieBlom, MikaelBjörkhage, MikaelKällberg, AndersLöfgren, PatrikReinhed, PeterRosén, StefanSimonsson, AnsgarZettergren, HenningSchmidt, Henning T.Cederquist, Henrik
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