Publikace ÚTF

Ultralong-range energy transfer by interatomic Coulombic decay in an extreme quantum system

Sisourat N.; Kryzhevoi N. V.; Kolorenč P.; Scheit S.; Jahnke T. and Cederbaum L. S.

When an atom is electronically excited, it relaxes by emitting
a photon or an electron. These carry essential information
on the electronic structure of their emitter. However, if an
atom is embedded in a chemical environment, another ultrafast
non-radiative decay process called interatomic Coulombic
decay (ICD) can become operative1. As ICD occurs only in
the presence of neighbours, it is highly sensitive to that
environment. Therefore, it has the potential to become a
powerful spectroscopic method to probe the close environment
of a system. ICD has been observed experimentally in van der
Waals clusters2–5 as well as in hydrogen-bonded systems6–8.
A key feature of ICD is that the excited atom can transfer
its excess energy to its neighbours over large distances.
The giant extremely weakly bound helium dimer is a perfect
candidate to investigate how far two atoms can exchange
energy. We report here that the two helium atoms within the
dimer can exchange energy by ICD over distances of more
than 45 times their atomic radius. Moreover, we demonstrate
that ICD spectroscopy can be used for imaging vibrational
wavefunctions of the ionized–excited helium dimer.
journal:Nature physics letters

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