Spontaneous decay of small copper-cluster anions<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cu</mml:mi><mml:mi>n</mml:mi></mml:msub><mml:msup><mml:mrow /><mml:mo>−</mml:mo></mml:msup></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mn>3</mml:mn><mml:mo>–</mml:mo><mml:mn>6</mml:mn></mml:mrow></mml:math>), on long time scales

Hansen, Klavs; Stockett, Mark H.; Kamińska, Magdalena; Nascimento, R F; Anderson, E. K.; Gatchell, Michael; Chartkunchand, K. C.; Eklund, Gustav; Zettergren, Henning; Schmidt, H. T.; Cederquist, H.

doi:10.1103/physreva.95.022511

Cited by 24 publications

(23 citation statements)

References 31 publications

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“…Similar behavior (i.e. different exponents in different time ranges) have been reported for the spontaneous decay from small copper cluster anions of size n = 3 -6 [14,16].…”

Section: Resultssupporting

confidence: 78%

“…There, electron detachment was the lowest energy decay channel for low J, while fragmentation was energetically more favourable at higher J. It was then speculated that this could be related to the twocomponent shape of the decay curve for some of the small copper clusters [16].…”

Section: Resultsmentioning

confidence: 99%

“…For large systems, such as amino acids, the absolute value of δ has typically been found to be smaller than 0.1 [22]. For small systems |δ| values of up to 1 have been reported [14,16,28,33].…”

Section: Modelling the Decay Of Excited Cluster Anionsmentioning

confidence: 99%

“…These photon emission processes will not produce neutrals but may quench the power law decay at times t approaching a characteristic time τ , when k rad (E) is no longer insignificant compared to k tot (E). The neutralization rate including radiative cooling processes, provided that k neutral is effectively negligible after the emission of the photon, is given by [16]…”

Section: Modelling the Decay Of Excited Cluster Anionsmentioning

confidence: 99%

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

et al. 2018

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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 (∼ 10 −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 →Ag − 3 + Ag and Ag − 5 →Ag − 3 + Ag2 fragmentation processes. arXiv:1805.12437v1 [physics.atm-clus] 31 May 2018

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“…Similar behavior (i.e. different exponents in different time ranges) have been reported for the spontaneous decay from small copper cluster anions of size n = 3 -6 [14,16].…”

Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Modelling the Decay Of Excited Cluster Anionsmentioning

confidence: 99%

Section: Modelling the Decay Of Excited Cluster Anionsmentioning

confidence: 99%

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

et al. 2018

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“…Measuring the infrared emission rate of PAHs is challenging as it requires they be isolated in a cold, collision free environment for timescales up to tens of seconds. Recent advances in cryogenic ion beam storage techniques have granted experimental access to such "ultra-slow" processes (Hansen et al 2017;Schmidt et al 2017). Here, we investigate the radiative cooling of coronene cations (C 24 H 12 + ) using two-dimensional (i.e.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic absorption profile and radiative cooling rate of a PAH cation revealed by action spectroscopy in the cryogenic electrostatic storage ring DESIREE

et al. 2019

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The multi-photon photodissociation (MPD) action spectrum of the coronene cation $$({{\rm{C}}_{24}}{\rm{H}}_{12}^ + )$$ has been measured as a function of storage time up to 60 s in the cryogenic electrostatic storage ring DESIREE. These measurements reveal not only the intrinsic absorption profile of isolated coronene cations, but also the rate at which hot-band absorptions are quenched by radiative cooling. The cooling rate is interpreted using a Simple Harmonic Cascade model of infrared vibrational emission.

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Decay Dynamics in Molecular Beams

Hansen

2020

Mass Spectrometry Reviews

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The phenomenon of power law decays in molecular beams is reviewed. The transition from a canonical to a microcanonical description of the decay is analyzed, and the appearance of the power law decay derived. Deviations from a power law often contain information on parallel competing processes. This is illustrated with examples where thermal radiation or dark unimolecular channels are the competing processes. Also corrections to the power law due to finite heat capacities and from nonideal energy distributions are derived. Finally, the consequences for the interpretation of action spectroscopy data are reviewed.

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Spontaneous decay of small copper-cluster anionsCun−(n=3–6), on long time scales

Cited by 24 publications

References 31 publications

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

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

Intrinsic absorption profile and radiative cooling rate of a PAH cation revealed by action spectroscopy in the cryogenic electrostatic storage ring DESIREE

Decay Dynamics in Molecular Beams

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