Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decays of excited silver cluster anions Ag$_{n}$, $n = 4$ to $7$, in
  DESIREE   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 ($\sim10^{-14}$) and
cryogenic (13 K) operation of DESIREE. The yield of neutral particles from
stored beams of Ag$_{6}$ and Ag$_{7}$ anions were measured for 100 milliseconds
and were found to follow single power law behaviour with millisecond time scale
exponential cut-offs. The Ag$_{4}$ and Ag$_{5}$ anions were stored for 60
seconds 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 determines this
behavior. Comparisons with the measurements strongly suggest that the neutral
particles detected in these time domains originate from Ag$_{4} \rightarrow$
Ag$_{3}+$ Ag and Ag$_{5}\rightarrow$ Ag$_{3}+$ Ag$_{2}$ fragmentation
processes.

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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: eess