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 multi-electron 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
grants:Non-radiative relaxation processes in ionized atomic and molecular systems, GAČR 208/12/0521; 2012-2015; hlavní řešitel: Přemysl Kolorenč
j.phys.b.49.082001.pdf (1571.79 kB)

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