Resonantly enhanced photoionization in correlated three-atomic systems

• Published in: arXiv.org
• Main Authors: Najjari, B, Müller, C, Voitkiv, A B
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 09.03.2012
• Subjects: Dipoles; Ionization potentials; Photoelectrons; Photoexcitation; Photoionization; Physics - Atomic Physics; Physics - Quantum Physics; Subsystems
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1203.2038

Modifications of photoionization arising from resonant electron-electron correlations between neighbouring atoms in an atomic sample are studied. The sample contains atomic species A and B, with the ionization potential of A being smaller than the energy of a dipole-allowed transition in B. The atoms are subject to an external radiation field which is near-resonant with the dipole transition in B. Photoionization of an atom A may thus proceed via a two-step mechanism: photoexcitation in the subsystem of species B, followed by interatomic Coulombic decay. As a basic atomic configuration, we investigate resonant photoionization in a three-atomic system A-B-B, consisting of an atom A and two neighbouring atoms B. It is found that, under suitable conditions, the influence of the neighbouring atoms can strongly affect the photoionization process, including its total probabilty, time development and photoelectron spectra. In particular, by comparing our results with those for photoionization of an isolated atom A and a two-atomic system A-B, respectively, we reveal the characteristic impact exerted by the third atom.