Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: SYCD Interatomic and intermolecular Coulombic decay (contributed for SYCD in A, MO)

A 34.3: Vortrag

Donnerstag, 21. März 2013, 14:45–15:00, B 302

Competition of ICD pathways in mixed neon-argon clusters — •Marko Förstel and Uwe Hergenhahn — Max-Planck-Institut für Plasmaphysik, c/o HZB-Bessy II, Albert-Einstein Str. 15, 12489 Berlin

Interatomic (or -molecular) coulombic decay (ICD) is an electronic deexcitation mediated by an energy transfer to the surrounding of the initially excited site.

Ne 2s excited, mixed Ne-Ar clusters exhibit both, Ne-Ar and Ne-Ne ICD. We measured both decay pathways simultaneously in mixed clusters of varying size and composition using electron-electron coincidence spectroscopy.

The decay rate of ICD is strongly dependent on the number and the distance to the neighbors of the initially excited atom. Additionally, the kinetic energy of the ICD electron allows for a direct assignment of the ICD pathway. Consequentially the structure of the mixed cluster can be probed by measuring the competition of Ne-Ne and Ne-Ar ICD.

I will present outer valence and inner valence spectra of Ne-Ar clusters of different sizes and composition. I will present electron-electron coincidence spectra of the same species. Both results will be used to discuss the composition and the structure of the clusters.