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Physical Review A

Two-center dielectronic recombination and resonant photoionization

Alexander B Voitkiv, Bennaceur Najjari

Published Nov 29, 2010• 29 citations
Publisher

Abstract

We consider radiative recombination and photoionization in an atomic system, which consists of two subsystems $A$ and $B$. These subsystems are well separated in space and it is supposed that $A$ has a lower ionization potential. In such a case photoionization of $A$ and recombination of an incident electron with ${A}^{+}$ can be strongly influenced, via two-center electron-electron correlations, by resonant electron dipole transitions induced in $B$. A theoretical description of these two-center resonant dielectronic processes is presented.

DOI
10.1103/physreva.82.052708

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We consider radiative recombination and photoionization in an atomic system, which consists of two subsystems AAA and BBB. These subsystems are well separated in space and it is supposed that AAA has a lower ionization potential. In such a case photoionization of AAA and recombination of an incident electron with A+{A}^{+}A+ can be strongly influenced, via two-center electron-electron correlations, by resonant electron dipole transitions induced in BBB. A theoretical description of these two-center resonant dielectronic processes is presented.
We consider one-photon ionization in a system consisting of two different atoms, AAA and BBB, which are well separated in space. In such a case, photoionization of the atom with a lower ionization potential can be very strongly influenced, via two-center electron-electron correlations, by resonant electron dipole transitions induced in the other atom. We present a detailed consideration of this resonant photoionization process and discuss a number of effects that are inherent to it.
Electron scattering and dielectronic recombination with an ion in the presence of a neighboring atom is studied. The incident electron is assumed to be captured by the ion, leading to resonant excitation of the atom which afterwards may stabilize either by electron reemission or radiative decay. We show that the participation of the atom can strongly affect, both quantitatively and qualitatively, the corresponding processes of electron scattering and recombination. Various ion-atom systems and electronic transitions are considered. In particular we show that electron scattering under backward angles may be strongly enhanced, provided the incident energy lies very close to the resonance. Besides, we derive the scaling behavior of two-center dielectronic recombination with the principal quantum numbers of the participating atomic states. The resonant enhancement in this process is shown to be so strong that it can compete with ordinary single-center recombination even after integrating over a rather broad distribution of incident electron energies.
A free electron can form a bound state with an atomic center AAA upon photoemission (radiative recombination). In the presence of a neighboring atom BBB, such a bound state can, under certain conditions, be also formed via resonant transfer of energy to BBB, with its subsequent relaxation through radiative decay (two-center dielectronic recombination). This two-center process is very efficient in the ``static'' case where AAA and BBB form a weakly bound system, dominating over single-center radiative recombination up to internuclear distances as large as several nanometers. Here we study its dynamic variant in which recombination occurs when a beam of species AAA collides with a gas of atoms BBB and show that, even though the average distance between AAA and BBB in collisions is orders of magnitude larger than the typical size of a bound system, the two-center recombination can still outperform the single-center radiative recombination.
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.
Photoionization of an atom AAA by a strong laser field in the presence of a spatially well-separated neighboring atom BBB is considered. The laser field frequency is assumed to lie below the ionization potential of atom AAA and be resonant with a dipole-allowed transition in atom BBB. In this situation, the ionization may occur either directly by multiphoton absorption from the laser field at the first atomic center or via an indirect pathway involving two-center electron-electron correlations, where the neighbor atom BBB is first photoexcited and, afterwards, transfers its energy upon deexcitation radiationlessly to atom AAA. Considering monochromatic as well as bichromatic laser fields, we study various coupling regimes of the photoionization process and identify experimentally accessible parameter domains where the two-center channel is dominant.
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 presence of neighbouring atoms can strongly affect the photoionization process, including its total probability, time development and photoelectron spectra. In particular, 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 made by the third atom.