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Issue 32, 2017
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Long-lived excited states in metal clusters

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Bare metal clusters have properties that make them interesting for applications in photochemistry and photovoltaics. Long-lived excited states are a prerequisite for such applications, because in them the energy of the photon can be stored. Clusters have a low density of states and long-lived excited states should therefore occur frequently. However, in fact, such states are a rarity, as indicated by time-resolved photoelectron data of mass-selected cluster anions. And there is another puzzling observation: only clusters with narrow peaks in their photoelectron spectra exhibit long-lived excited states. Both findings can be explained if internal conversion, i.e. the conversion of electronic excitation energy into vibrational excitations, is the major relaxation mechanism in clusters. It becomes more likely, if a change of the electronic configuration results in a large geometry change, which is probably the case for most clusters. Only clusters with a weak coupling between geometric and electronic structure may have long-lived excited states and narrow peaks.

Graphical abstract: Long-lived excited states in metal clusters

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Publication details

The article was received on 26 Apr 2017, accepted on 21 Jul 2017 and first published on 24 Jul 2017

Article type: Paper
DOI: 10.1039/C7CP02748F
Citation: Phys. Chem. Chem. Phys., 2017,19, 21335-21339

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    Long-lived excited states in metal clusters

    A. Koop, G. Gantefoer and Y. D. Kim, Phys. Chem. Chem. Phys., 2017, 19, 21335
    DOI: 10.1039/C7CP02748F

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