Publikace ÚTF

Interatomic Coulombic Decay Mediated by Ultrafast Superexchange Energy Transfer

Miteva, T.; Kazandjian, S.; Kolorenč, P.; Votavová, P. and Sisourat, N.

Inner-valence ionized states of atoms and molecules live shorter if these species are embedded in an
environment due to the possibility for ultrafast deexcitation known as interatomic Coulombic decay (ICD).
In this Letter we show that the lifetime of these ICD active states decreases further when a bridge atom is in
proximity to the two interacting monomers. This novel mechanism, termed superexchange ICD, is an
electronic correlation effect driven by the efficient energy transfer via virtual states of the bridge atom.
The superexchange ICD is discussed in detail on the example of the NeHeNe trimer. We demonstrate that
the decay width of the Neþð2s−1Þ 2Σþ g resonance increases 6 times in the presence of the He atom at a
distance of 4 Å between the two Ne atoms. Using a simple model, we provide a qualitative explanation of
the superexchange ICD and we derive analytical expressions for the dependence of the decay width on the
distance between the neon atoms.
journal:Phys. Rev. Lett.

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