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MO: Fachverband Molekülphysik
MO 2: Atomic Clusters (joint session A/MO)
MO 2.7: Vortrag
Montag, 9. März 2020, 16:00–16:15, a320
Coulomb interaction in the photoemission of polyanionic silver clusters — •Norman Iwe1, Franklin Martinez1, Madlen Müller2, Klara Raspe1, Lutz Schweikhard2, Josef Tiggesbäumker1, and Karl-Heinz Meiwes-Broer1 — 1Institut für Physik, Universität Rostock, Rostock, Deutschland — 2Institut für Physik, Universität Greifswald, Greifswald, Deutschland
Multiply negatively charged, nano-sized particles are characterized by a barrier potential, given by the Coulomb interaction between the excess electrons. In order to extract details of this barrier with unprecedented quality, photoelectron spectroscopy is combined with tunable laser pulse excitation. The emitted photoelectron interacts with the remaining negatively charged system, which leads to a specific Coulomb cut-off in the photoelectron spectra, as known from molecular polyanions.
In this contribution, we present experimental spectra of mass- and charge-selected silver clusters, Ag800z− (z=2-6), which show a characteristic dependence on the laser wavelength. The photoelectron spectra are qualitatively described by electrons coming from a Fermi distribution in a jellium-like potential, while direct emission as well as tunneling through the Coulomb barrier are taken into account.