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Decays of excited silver-cluster anions Agn, n = 4 to 7, in the Double ElectroStatic Ion Ring ExpEriment

Artikel i vetenskaplig tidskrift
Författare Emma K. Andersson
M. Kaminska
K. C. Chartkunchand
G. Eklund
M. Gatchell
Klavs Hansen
Henning Zettergren
Henrik Cederquist
Henning T. Schmidt
Publicerad i Physical Review A. Atomic, Molecular, and Optical Physics
Volym 98
Nummer/häfte 2
ISSN 1050-2947
Publiceringsår 2018
Publicerad vid Institutionen för fysik (GU)
Språk en
Länkar dx.doi.org/10.1103/PhysRevA.98.0227...
Ämneskategorier Atom- och molekylfysik och optik

Sammanfattning

Spontaneous decays of small, hot silver-cluster anions Agn− , 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 (∼10−14) and cryogenic (13 K) operation of DESIREE. The yield of neutral particles from stored beams of Ag6− and Ag7− anions were measured for 100 milliseconds and were found to followsingle power-lawbehavior with millisecond time-scale exponential cutoffs. The Ag4− andAg5− anions were stored for 60 s and the observed decays showtwo-component power-lawbehaviors. We present calculations of the rate constants for electron detachment from and fragmentation of Ag4− and Ag5−. 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 Ag4- and Ag5−, which extends to tens and hundreds of milliseconds, respectively. The fact that the calculations reproduce the early slopes of Ag4− and Ag5−, which differ for the two cases, suggests that it is the changes in fragmentation rates with internal cluster energies of Ag4− and Ag5− 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 Ag4− → Ag3− + Ag and Ag5− → Ag3− + Ag2 fragmentation processes.

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