Coherent and stochastic contributions of compound resonances in atomic processes: Electron recombination, photoionization and scattering

Abstract

In open-shell atoms and ions, processes such as photoionization, combination (Raman) scattering, electron scattering and recombination, are often mediated by many-electron compound resonances. We show that their interference (neglected in the independent-resonance approximation) leads to a coherent contribution, which determines the energy-averaged total cross sections of electron- and photon-induced reactions obtained using the optical theorem. In contrast, the partial cross sections (e.g., electron recombination, or photon Raman scattering) are dominated by the stochastic contributions. Thus, the optical theorem provides a link between the stochastic and coherent contributions of the compound resonances. Similar conclusions are valid for reactions via compound states in molecules and nuclei.

References in corpus (4)

• Positron-molecule interactions: resonant attachment, annihilation, and bound states
• Dielectronic recombination of xenonlike tungsten ions
• Absolute cross sections for photoionization of Xe${}^{q+}$ ions (1 $\le$ q $\le$ 5) at the 3d ionization threshold
• Recombination of W18+ ions with electrons: Absolute rate coefficients from a storage-ring experiment and from theoretical calculations

Cited by in corpus (4)

• Photoionization of ions with synchrotron radiation: From ions in space to atoms in cages
• Recombination of open-f-shell tungsten ions
• Prediction of quantum many-body chaos in protactinium atom
• Random matrix theory analysis of a temperature-related transformation in statistics of Fano-Feshbach resonances in Thulium atoms