Publikace ÚTF

Site- and energy-selective slow-electron production through intermolecular Coulombic decay

Gokhberg1, K.; Kolorenč, P.; Kuleff, A. I.;Cederbaum, L. S.

Irradiation of matter with light tends to electronically excite atoms
and molecules, with subsequent relaxation processes determining
where the photon energy is ultimately deposited and electrons and
ions produced. In weakly bound systems, intermolecular Coulombic
decay1 (ICD) enables very efficient relaxation of electronic excitation
through transfer of the excess energy to neighbouring atoms or
molecules that then lose an electron and become ionized2–9. Here we
propose that the emission site and energy of the electrons released
during this process can be controlled by coupling the ICD to a resonant
core excitation.Weillustrate this concept withab initio manybody
calculations on the argon–krypton model system, where resonant
photoabsorption produces an initial or ‘parent’ excitation of the
argon atom, which then triggers a resonant-Auger-ICDcascade that
ends with the emission of a slow electron from the krypton atom.
Our calculations showthat the energy of the emitted electrons depends
sensitively on the initial excited state of the argon atom. The incident
energy can thus be adjusted both to produce the initial excitation in
a chosen atom and to realize an excitation that will result in the
emission of ICD electrons with desired energies. These properties of
the decay cascade might have consequences for fundamental and
applied radiation biology and could be of interest in the development
of new spectroscopic techniques.
nature12936.pdf (601.48 kB)

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