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arXiv:1109.2739 · Physical Review A

Collectively enhanced resonant photoionization in a multiatom ensemble

Carsten Müller, Mihai Macovei, Alexander B Voitkiv

Published Nov 21, 2011• 12 citations
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Abstract

Photoionization of an atom via interatomic correlations to $N$ neighboring atoms may be strongly enhanced due to constructive interference of quantum pathways. The ionization proceeds via resonant photoexcitation of a neighbor atom and subsequent interatomic Coulombic decay. The enhancement can scale with ${N}^{2}$, leading to ``superenhanced photoionization.''

DOI
10.1103/physreva.84.055401

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Photoionization of an atom via interatomic correlations to NNN neighboring atoms may be strongly enhanced due to constructive interference of quantum pathways. The ionization proceeds via resonant photoexcitation of a neighbor atom and subsequent interatomic Coulombic decay. The enhancement can scale with N2{N}^{2}N2, leading to ``superenhanced photoionization.''
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.
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.
We consider photoionization in a system of two atoms of different species caused by a laser field. In this process an inner-valence vacancy, created by photoexcitation in one of the atoms, decays not only due to intra- but also interatomic electron-electron correlations with the energy release in the latter case being transferred to the other atom which is ionized. We show that when the intensity of the laser field increases this photoionization process---due to Rabi oscillations and Pauli blocking---may acquire qualitatively new features in its time evolution and the electron emission spectra.