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Journal Article

Core-level interatomic Coulombic decay in van der Waals clusters


Hergenhahn,  U.
Molecular Physics, Fritz Haber Institute, Max Planck Society;
Leibniz-Institut für Oberflächenmodifizierung (IOM;

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Hans, A., Küstner-Wetekam, C., Schmidt, P., Ozga, C., Holzapfel, X., Otto, H., et al. (2020). Core-level interatomic Coulombic decay in van der Waals clusters. Physical Review Research, 2(1): 012022(R). doi:10.1103/PhysRevResearch.2.012022.

Cite as: http://hdl.handle.net/21.11116/0000-0005-8D02-A
We report on the experimental observation of the direct decay of a core vacancy in van der Waals clusters byemission of a fast electron from a neighboring atom. The process can be regarded as an interatomic Coulombicdecay of core holes (core-level ICD). We identify it unambiguously by electron-electron and electron-electron-photon coincidence spectroscopy of the decay of 2pvacancies in Ar clusters. While several earlier works reportedthe absence of this channel, we find core-level ICD to be of considerable significance and quantify the branchingratio of this nonlocal electron emission to conventional local Auger decay as (0.8±0.2)%. Our results aresupported by calculations on smaller clusters and show a reasonable agreement. This report on a successfullyperformed electron-electron-photon coincidence experiment provides a perspective for explorations of matterexposed to ionizing radiation. The observed core-level ICD is proposed to be of general importance for studieson charge redistribution after core-level photoionization where van der Waals clusters are often used as prototypesystems.