Special Issue "Many-Electron and Multiphoton Atomic Processes: A Tribute to Miron Amusia"

A special issue of Atoms (ISSN 2218-2004).

Deadline for manuscript submissions: 1 August 2022 | Viewed by 4084

Special Issue Editors

Prof. Dr. Anatoli Kheifets
E-Mail Website
Guest Editor
Research School of Physical Sciences, Australian National University, Canberra, ACT 2600, Australia
Interests: theoretical atomic and condensed matter physics
Dr. Gleb Gribakin
E-Mail Website
Guest Editor
School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK
Interests: many-body theory in atom; electron-atom scattering, negative ions, photodetachmen, multiphoton processes in strong laser fields
Prof. Dr. Vadim Ivanov
E-Mail Website
Guest Editor
Department of Physics, Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia
Interests: theoretical physics; condensed matter; physics of nanostructures; atomic and molecular physics

Special Issue Information

Dear Colleagues,

This Special Issue will contain contributions from numerous colleagues and collaborators of the late Prof. Miron Amusia, who had been a key figure in the international theoretical atomic physics community over the past half a century. The focus of the Special Issue will be on many-electron and multiphoton atomic processes which are at the forefront of contemporary atomic and molecular physics. Special attention will be given to many-electron correlation problems and its interplay with strong-field laser–atom interactions. Recent advances in the generation of short and intense laser pulses make this problem particularly topical. Although some recent topical issues have addressed strong laser physics and attosecond science (MDPI Applied Sciences 2019,  IOP J.Phys & J.Photonics 2020), the many-electron correlation problem has never been the focus in this context. Therefore, the present proposal will usefully supplement existing literature and will be of interest to a large section of the atomic and strong laser physics community, both theoretically and experimentally.

Prof. Dr. Anatoli Kheifets
Dr. Gleb Gribakin
Prof. Dr. Vadim Ivanov
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atoms is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this special issue is free of charge. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • theoretical atomic and molecular physics
  • electronic structure of atoms and molecules
  • many-electron correlation
  • strong laser–atom interaction
  • attosecond science
  • high-order harmonic generation
  • tunneling and multi-photon ionization
  • electron scattering from atoms and molecules
  • endohedral atoms

Published Papers (8 papers)

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Research

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Article
Strong-Field Ionization Amplitudes for Atomic Many-Electron Targets
Atoms 2022, 10(3), 70; https://doi.org/10.3390/atoms10030070 - 30 Jun 2022
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Abstract
The strong-field approximation (SFA) has been widely applied in the literature to model the ionization of atoms and molecules by intense laser pulses. A recent re-formulation of the SFA in terms of partial waves and spherical tensor operators helped adopt this approach to [...] Read more.
The strong-field approximation (SFA) has been widely applied in the literature to model the ionization of atoms and molecules by intense laser pulses. A recent re-formulation of the SFA in terms of partial waves and spherical tensor operators helped adopt this approach to account for realistic atomic potentials and pulses of different shape and time structure. This re-formulation also enables one to overcome certain limitations of the original SFA formulation with regard to the representation of the initial-bound and final-continuum wave functions of the emitted electrons. We here show within the framework of Jac, the Jena Atomic Calculator, how the direct SFA ionization amplitude can be readily generated and utilized in order to compute above-threshold ionization (ATI) distributions for many-electron targets and laser pulses of given frequency, intensity, polarization, pulse duration and carrier–envelope phase. Examples are shown for selected ATI energy, angular as well as momentum distributions in the strong-field ionization of atomic krypton. We also briefly discuss how this approach can be extended to incorporate rescattering and high-harmonic processes into the SFA amplitudes. Full article
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Article
Quasifree Photoionization under the Reaction Microscope
Atoms 2022, 10(3), 68; https://doi.org/10.3390/atoms10030068 - 28 Jun 2022
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Abstract
We experimentally investigated the quasifree mechanism (QFM) in one-photon double ionization of He and H2 at 800 eV photon energy and circular polarization with a COLTRIMS reaction microscope. Our work provides new insight into this elusive photoionization mechanism that was predicted by [...] Read more.
We experimentally investigated the quasifree mechanism (QFM) in one-photon double ionization of He and H2 at 800 eV photon energy and circular polarization with a COLTRIMS reaction microscope. Our work provides new insight into this elusive photoionization mechanism that was predicted by Miron Amusia more than four decades ago. We found the distinct four-fold symmetry in the angular emission pattern of QFM electrons from H2 double ionization that has previously only been observed for He. Furthermore, we provide experimental evidence that the photon momentum is not imparted onto the center of mass in quasifree photoionization, which is in contrast to the situation in single ionization and in double ionization mediated by the shake-off and knock-out mechanisms. This finding is substantiated by numerical results obtained by solving the system’s full-dimensional time-dependent Schrödinger equation beyond the dipole approximation. Full article
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Article
Spin Polarization of Electrons in Two-Color XUV + Optical Photoionization of Atoms
Atoms 2022, 10(2), 66; https://doi.org/10.3390/atoms10020066 - 20 Jun 2022
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Abstract
The spin polarization of photoelectrons in two-color XUV + optical multiphoton ionization is theoretically considered using strong field approximation. We assume that both the XUV and the optical radiation are circularly polarized. It is shown that the spin polarization is basically determined by [...] Read more.
The spin polarization of photoelectrons in two-color XUV + optical multiphoton ionization is theoretically considered using strong field approximation. We assume that both the XUV and the optical radiation are circularly polarized. It is shown that the spin polarization is basically determined by the XUV photoabsorption and that the sidebands are spin polarized as well. Their polarization may be larger or smaller than that of the central photoelectron line depending on the helicity of the dressing field. Full article
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Article
Taking the Convergent Close-Coupling Method beyond Helium: The Utility of the Hartree-Fock Theory
Atoms 2022, 10(1), 22; https://doi.org/10.3390/atoms10010022 - 11 Feb 2022
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Abstract
The convergent close-coupling (CCC) method was initially developed to describe electron scattering on atomic hydrogen and the hydrogenic ions such as He+. The latter allows implementation of double photoionization (DPI) of the helium atom. For more complex single valence-electron atomic and [...] Read more.
The convergent close-coupling (CCC) method was initially developed to describe electron scattering on atomic hydrogen and the hydrogenic ions such as He+. The latter allows implementation of double photoionization (DPI) of the helium atom. For more complex single valence-electron atomic and ionic targets, the direct and exchange interaction with the inner electron core needs to be taken into account. For this purpose, the Hartree-Fock (HF) computer codes developed in the group of Miron Amusia have been adapted. In this brief review article, we demonstrate the utility of the HF technique by examples of electron scattering on Li and the DPI of the H and Li ions. We also discuss that modern-day computer infrastructure allows the associated CCC code, and others, to be readily run directly via the Atomic, Molecular and Optical Science Gateway. Full article
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Article
Accurate Exponential Representations for the Ground State Wave Functions of the Collinear Two-Electron Atomic Systems
Atoms 2022, 10(1), 4; https://doi.org/10.3390/atoms10010004 - 29 Dec 2021
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Abstract
In the framework of the study of helium-like atomic systems possessing the collinear configuration, we propose a simple method for computing compact but very accurate wave functions describing the relevant S-state. It is worth noting that the considered states include the well-known states [...] Read more.
In the framework of the study of helium-like atomic systems possessing the collinear configuration, we propose a simple method for computing compact but very accurate wave functions describing the relevant S-state. It is worth noting that the considered states include the well-known states of the electron–nucleus and electron–electron coalescences as a particular case. The simplicity and compactness imply that the considered wave functions represent linear combinations of a few single exponentials. We have calculated such model wave functions for the ground state of helium and the two-electron ions with nucleus charge 1Z5. The parameters and the accompanying characteristics of these functions are presented in tables for number of exponential from 3 to 6. The accuracy of the resulting wave functions are confirmed graphically. The specific properties of the relevant codes by Wolfram Mathematica are discussed. An example of application of the compact wave functions under consideration is reported. Full article
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Article
Time Delay in Electron Collision with a Spherical Target as a Function of the Scattering Angle
Atoms 2021, 9(4), 105; https://doi.org/10.3390/atoms9040105 - 01 Dec 2021
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Abstract
We have studied the angular time delay in slow-electron elastic scattering by spherical targets as well as the average time delay of electrons in this process. It is demonstrated how the angular time delay is connected to the Eisenbud–Wigner–Smith (EWS) time delay. The [...] Read more.
We have studied the angular time delay in slow-electron elastic scattering by spherical targets as well as the average time delay of electrons in this process. It is demonstrated how the angular time delay is connected to the Eisenbud–Wigner–Smith (EWS) time delay. The specific features of both angular and energy dependencies of these time delays are discussed in detail. The potentialities of the derived general formulas are illustrated by the numerical calculations of the time delays of slow electrons in the potential fields of both absolutely hard-sphere and delta-shell potential well of the same radius. The conducted studies shed more light on the specific features of these time delays. Full article
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Review

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Review
Peculiar Physics of Heavy-Fermion Metals: Theory versus Experiment
Atoms 2022, 10(3), 67; https://doi.org/10.3390/atoms10030067 - 23 Jun 2022
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Abstract
This review considers the topological fermion condensation quantum phase transition (FCQPT) that leads to flat bands and allows the elucidation of the special behavior of heavy-fermion (HF) metals that is not exhibited by common metals described within the framework of the Landau Fermi [...] Read more.
This review considers the topological fermion condensation quantum phase transition (FCQPT) that leads to flat bands and allows the elucidation of the special behavior of heavy-fermion (HF) metals that is not exhibited by common metals described within the framework of the Landau Fermi liquid (LFL) theory. We bring together theoretical consideration within the framework of the fermion condensation theory based on the FCQPT with experimental data collected on HF metals. We show that very different HF metals demonstrate universal behavior induced by the FCQPT and demonstrate that Fermi systems near the FCQPT are controlled by the Fermi quasiparticles with the effective mass M* strongly depending on temperature T, magnetic field B, pressure P, etc. Within the framework of our analysis, the experimental data regarding the thermodynamic, transport and relaxation properties of HF metal are naturally described. Based on the theory, we explain a number of experimental data and show that the considered HF metals exhibit peculiar properties such as: (1) the universal T/B scaling behavior; (2) the linear dependence of the resistivity on T, ρ(T)A1T (with A1 is a temperature-independent coefficient), and the negative magnetoresistance; (3) asymmetrical dependence of the tunneling differential conductivity (resistivity) on the bias voltage; (4) in the case of a flat band, the superconducting critical temperature Tcg with g being the coupling constant, while the M* becomes finite; (5) we show that the so called Planckian limit exhibited by HF metals with ρ(T)T is defined by the presence of flat bands. Full article
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Review
ATOM Program System and Computational Experiment
Atoms 2022, 10(2), 52; https://doi.org/10.3390/atoms10020052 - 24 May 2022
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Abstract
The article is devoted to a brief description of the ATOM computer program system, designed to study the structure, transition probabilities and cross sections of various processes in multielectron atoms. The theoretical study was based on the concept of a computational experiment, the [...] Read more.
The article is devoted to a brief description of the ATOM computer program system, designed to study the structure, transition probabilities and cross sections of various processes in multielectron atoms. The theoretical study was based on the concept of a computational experiment, the main provisions of which are discussed in the article. The main approximate methods used in the system of programs for taking many-electron correlations into account and determining their role in photoionization processes, elastic and inelastic electron scattering, the decay of vacancies, and many others are presented. The most significant results obtained with this software are listed. Full article

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.


Author Affiliation   Title
Valeriy Dolmatov University of North Alabama, Florence, USA   Ionization and scattering processes in encapsulated atoms
Marcus Dahlström Lund University, Sweden   Time-delay in two-photon ionization processes
Victor Sukhorukov Rostov University, Russia   Studying many-electron processes with fluorescence spectroscopy
Horst Schmidt-Bocking Institut fur Kernphysik, Universitat Frankfurt, Germany   On the formation of "long living" spin-polarized metastable atoms - A chance for very efficient storage of electric-energy
Elena Gryzlova Moscow State University Russia   Cooper minima of excited atomic states
Gleb Gribakin Queen's University Belfast   Low-energy positron scattering
       
       
       
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