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Spontaneous decay of small copper-cluster anions Cu-n(-) (n=3-6), on long time scales
Stockholm University, Faculty of Science, Department of Physics. Aarhus University, Denmark.
Stockholm University, Faculty of Science, Department of Physics. Jan Kochanowski University, Poland.
Stockholm University, Faculty of Science, Department of Physics. Centro Federal de Educacao Tecnologica Celso Suckow da Fonseca, Brazil.
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Number of Authors: 112017 (English)In: Physical Review A, ISSN 2469-9926, Vol. 95, no 2, article id 022511Article in journal (Refereed) Published
Abstract [en]

We have measured the spontaneous neutral particle emission from copper-cluster anions ( Cu-n(-), n = 3-6) stored at cryogenic temperatures in one of the electrostatic ion storage rings of the Double ElectroStatic Ion Ring ExpEriment facility at Stockholm University. The measured rate of emission from the stored Cu-3(-) ions follows a single power-law decay for about 1 ms but then decreases much more rapidly with time. The latter behavior may be due to a decrease in the density of available final states in Cu-3 as the excitation energies of the decaying ions approach the electron detachment threshold. The emissions from Cu-4(-), Cu-5(-), and Cu-6(-) are well described by sums of two power laws that are quenched by radiative cooling of the stored ions with characteristic times between a few and hundreds of milliseconds. We relate these two-component behaviors to populations of stored ions with higher and lower angular momenta. In a separate experiment, we studied the laser-induced decay of Cu-6(-) ions that were excited by 1.13- or 1.45-eV photons after 46 ms of storage.

Place, publisher, year, edition, pages
2017. Vol. 95, no 2, article id 022511
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-142490DOI: 10.1103/PhysRevA.95.022511ISI: 000395979500009OAI: oai:DiVA.org:su-142490DiVA, id: diva2:1095687
Available from: 2017-05-15 Created: 2017-05-15 Last updated: 2019-03-29Bibliographically 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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Stockett, Mark H.Kaminska, MagdalenaNascimento, Rodrigo F.Anderson, Emma K.Gatchell, MichaelChartkunchand, Kiattichart C.Eklund, GustavZettergren, HenningSchmidt, Henning T.Cederquist, Henrik
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