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Decays of excited s...
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Anderson, Emma K.Stockholms universitet,Fysikum
(author)
Decays of excited silver-cluster anions Agn, n=4 to 7, in the Double ElectroStatic Ion Ring ExpEriment
- Article/chapterEnglish2018
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LIBRIS-ID:oai:DiVA.org:su-160075
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-160075URI
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https://doi.org/10.1103/PhysRevA.98.022705DOI
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https://gup.ub.gu.se/publication/270049URI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Spontaneous decays of small, hot silver-cluster anions Ag-n(-), n = 4-7, have been studied using one of the rings of the Double ElectroStatic Ion Ring ExpEriment (DESIREE). Observation of these decays over very long time scales is possible due to the very low residual gas pressure (similar to 10(-14)) and cryogenic (13 K) operation of DESIREE. The yield of neutral particles from stored beams of Ag-6(-) and Ag-2(-) anions were measured for 100 milliseconds and were found to follow single power-law behavior with millisecond time-scale exponential cutoffs. The Ag-4(-) and Ag-5(-) anions were stored for 60 s and the observed decays show two-component power-law behaviors. We present calculations of the rate constants for electron detachment from and fragmentation of Ag-4(-) and Ag-5(-). In these calculations, we assume that the internal energy distribution of the clusters are flat and with this we reproduce the early steep parts of the experimentally measured decay curves for Ag-4(-) and Ag-5(-) which extends to tens and hundreds of milliseconds, respectively. The fact that the calculations reproduce the early slopes of Ag-4(-) and Ag-5(-), which differ for the two cases, suggests that it is the changes in fragmentation rates with internal cluster energies of Ag-4(-) and Ag-5(-) rather than conditions in the ion source that determine this behavior. Comparisons with the measurements strongly suggest that the neutral particles detected in these time domains originate from Ag-4(-) -> Ag-3(-) + Ag and Ag-5(-) -> Ag-3(-) +Ag-2 fragmentation processes.
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Kamińska, MagdalenaStockholms universitet,Fysikum,Jan Kochanowski University, Poland(Swepub:su)magda
(author)
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Chartkunchand, Kiattichart C.Stockholms universitet,Fysikum(Swepub:su)kchar
(author)
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Eklund, GustavStockholms universitet,Fysikum(Swepub:su)guek5896
(author)
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Gatchell, MichaelStockholms universitet,Fysikum,University of Innsbruck, Austria(Swepub:su)miga8512
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Hansen, Klavs,1958Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:gu)xhankl
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Zettergren, HenningStockholms universitet,Fysikum(Swepub:su)henning
(author)
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Cederquist, HenrikStockholms universitet,Fysikum(Swepub:su)cederq
(author)
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Schmidt, Henning T.Stockholms universitet,Fysikum(Swepub:su)schmidt
(author)
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Stockholms universitetFysikum
(creator_code:org_t)
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