Publikace ÚTF

Collective relaxation processes in atoms, molecules and clusters

Kolorenč, P.; Averbukh, V.; Feifel, R.; Eland, J.

Electron correlation is an essential driver of a variety of relaxation processes in excited atomic
and molecular systems. These are phenomena which often lead to autoionization typically
involving two-electron transitions, such as the well-known Auger effect. However, electron
correlation can give rise also to higher-order processes characterized by multi-electron
transitions. Basic examples include simultaneous two-electron emission upon recombination of
an inner-shell vacancy (double Auger decay) or collective decay of two holes with emission of a
single electron. First reports of this class of processes date back to the 1960s, but their
investigation intensified only recently with the advent of free-electron lasers. High fluxes of
high-energy photons induce multiple excitation or ionization of a system on the femtosecond
timescale and under such conditions the importance of multi-electron processes increases
significantly. We present an overview of experimental and theoretical works on selected multielectron
relaxation phenomena in systems of different complexity, going from double Auger
decay in atoms and small molecules to collective interatomic autoionization processes in
nanoscale samples.
journal:Journal of Physics B Atomic Molecular Physics
j.phys.b.49.082001.pdf (1571.79 kB)

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