Cresting the Coulomb Barrier of Polyanionic Metal Clusters

Combining photoelectron spectroscopy with tunable laser pulse excitation allows us to characterize the Coulomb barrier potential of multiply negatively charged silver clusters. The spectra of mass- and charge-selected polyanionic systems, with z=2-5 excess electrons, show a characteristic dependence...

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Bibliographic Details
Published in:Physical review letters 2021-04, Vol.126 (13), p.133001-133001, Article 133001
Main Authors: Martinez, F, Iwe, N, Müller, M, Raspe, K, Schweikhard, L, Tiggesbäumker, J, Meiwes-Broer, K-H
Format: Article
Language:English
Subjects:
Electron tunneling
Excitation
Metal clusters
Photoelectric emission
Photoelectrons
Potential energy
Silver
Spectrum analysis
Tunable lasers
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Summary:Combining photoelectron spectroscopy with tunable laser pulse excitation allows us to characterize the Coulomb barrier potential of multiply negatively charged silver clusters. The spectra of mass- and charge-selected polyanionic systems, with z=2-5 excess electrons, show a characteristic dependence on the excitation energy, which emphasizes the role of electron tunneling through the barrier. By evaluating experimental data from an 800-atom system, the electron yield is parametrized with respect to tunneling near the photoemission threshold. This analysis results in the first experimentally based potential energy functions of polyanionic metal clusters.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.126.133001