Journal Description
Atoms
Atoms
is an international, peer-reviewed, open access journal on all aspects of the atom published monthly online by MDPI.
- Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.
- High Visibility: indexed within Scopus, ESCI (Web of Science), Astrophysics Data System, Inspec, CAPlus / SciFinder, INSPIRE, and other databases.
- Journal Rank: CiteScore - Q2 (Nuclear and High Energy Physics)
- Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 23.3 days after submission; acceptance to publication is undertaken in 3.9 days (median values for papers published in this journal in the second half of 2023).
- Recognition of Reviewers: reviewers who provide timely, thorough peer-review reports receive vouchers entitling them to a discount on the APC of their next publication in any MDPI journal, in appreciation of the work done.
Impact Factor:
1.8 (2022);
5-Year Impact Factor:
1.8 (2022)
Latest Articles
CollisionDB: A New Database of Atomic and Molecular Collisional Processes with an Interactive API
Atoms 2024, 12(4), 20; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12040020 - 27 Mar 2024
Abstract
The Atomic and Molecular Data Unit of the International Atomic Energy Agency has developed a new database, CollisionDB, to provide an open, free, robust and long-term repository of data on plasma collisional processes. The database contains data on cross sections and rate coefficients
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The Atomic and Molecular Data Unit of the International Atomic Energy Agency has developed a new database, CollisionDB, to provide an open, free, robust and long-term repository of data on plasma collisional processes. The database contains data on cross sections and rate coefficients for collisions of electrons, photons and heavy particles with atomic and molecular species. A fundamental requirement for this database is the implementation of standardized metadata, which provide an unambiguous description of the collisional data available in peer-reviewed sources. CollisionDB offers both a browser-based search interface and an application programming interface (API) that allows users to filter, process and compare collisional datasets. For this purpose, a Python package PyCollisionDB has been developed to access the CollisionDB API. Here, we present an overview of the technical developments, including data schemas, standards and user interface underlying the CollisionDB application, with particular emphasis on the API developed to support the integration of data into modeling and other codes.
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(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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Open AccessArticle
Line Shape Code Comparison of the Effect of Periodic Fields on Hydrogen Lines
by
Ibtissem Hannachi, Spiros Alexiou and Roland Stamm
Atoms 2024, 12(4), 19; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12040019 - 22 Mar 2024
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Spectral line shapes code in plasmas (SLSPs) code comparison workshops have been organized in the last decade with the aim of comparing the spectra obtained with independently developed analytical and numerical models. Here, we consider the simultaneous effect of a plasma microfield and
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Spectral line shapes code in plasmas (SLSPs) code comparison workshops have been organized in the last decade with the aim of comparing the spectra obtained with independently developed analytical and numerical models. Here, we consider the simultaneous effect of a plasma microfield and a periodic electric field on the hydrogen lines Lyman-α, Lyman-β, Balmer-α, and Balmer-β for plasma conditions where the Stark effect usually dominates line broadening.
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Open AccessArticle
EWS Time Delay in Low Energy e−C60 Elastic Scattering
by
Aiswarya R., Rasheed Shaik, Jobin Jose, Hari R. Varma and Himadri S. Chakraborty
Atoms 2024, 12(3), 18; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12030018 - 21 Mar 2024
Abstract
Access to time delay in a projectile-target scattering is a fundamental tool in understanding their interactions by probing the temporal domain. The present study focuses on computing and analyzing the Eisenbud-Wigner-Smith (EWS) time delay in low energy elastic scattering.
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Access to time delay in a projectile-target scattering is a fundamental tool in understanding their interactions by probing the temporal domain. The present study focuses on computing and analyzing the Eisenbud-Wigner-Smith (EWS) time delay in low energy elastic scattering. The investigation is carried out in the framework of a non-relativistic partial wave analysis (PWA) technique. The projectile-target interaction is described in (i) Density Functional Theory (DFT) and (ii) Annular Square Well (ASW) static model, and their final results are compared in details. The impact of polarization on resonant and non-resonant time delay is also investigated.
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(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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Open AccessCommunication
General Aspects of Line Shapes in Plasmas in the Presence of External Electric Fields
by
Spiros Alexiou
Atoms 2024, 12(3), 17; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12030017 - 15 Mar 2024
Abstract
The present paper discusses a number of topics relevant to line broadening in the presence of periodic oscillatory fields. Specifically, we discuss the applicablility of the expression usually employed to compute the autocorrelation function, the dressing, accounting for random phases, neglecting fine structure
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The present paper discusses a number of topics relevant to line broadening in the presence of periodic oscillatory fields. Specifically, we discuss the applicablility of the expression usually employed to compute the autocorrelation function, the dressing, accounting for random phases, neglecting fine structure and numerical issues associated with stiffnes.
Full article
(This article belongs to the Special Issue Plasma Spectroscopy and Plasma Diagnostics: From Classical to Sophisticated Methods)
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Open AccessArticle
Simulation of Extreme Ultraviolet Radiation and Conversion Efficiency of Lithium Plasma in a Wide Range of Plasma Situations
by
Xiangdong Li, Frank B. Rosmej and Zhanbin Chen
Atoms 2024, 12(3), 16; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12030016 - 12 Mar 2024
Abstract
Based on the detailed term accounting approach, the relationship between extreme ultraviolet conversion efficiency and plasma conditions, which range from 5 to 200 eV for plasma temperature and from 4.63 × 1017 to 4.63 × 1022 cm−3 for plasma density,
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Based on the detailed term accounting approach, the relationship between extreme ultraviolet conversion efficiency and plasma conditions, which range from 5 to 200 eV for plasma temperature and from 4.63 × 1017 to 4.63 × 1022 cm−3 for plasma density, is studied for lithium plasmas through spectral simulations involving very extended atomic configurations, including a benchmark set of autoionizing states. The theoretical limit of the EUV conversion efficiency and its dependence on sustained plasma time are given for different plasma densities. The present study provides the necessary understanding of EUV formation from the perspective of atomic physics and also provides useful knowledge for improving EUV conversion efficiency with different technologies.
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(This article belongs to the Special Issue Atomic Physics in Dense Plasmas)
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Open AccessBrief Report
Continuous Acceleration Sensing Using Optomechanical Droplets
by
Gordon R. M. Robb, Josh G. Walker, Gian-Luca Oppo and Thorsten Ackemann
Atoms 2024, 12(3), 15; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12030015 - 06 Mar 2024
Abstract
We show that a Bose–Einstein Condensate illuminated by a far off-resonant optical pump field and its retroreflection from a feedback mirror can produce stable, localised structures known as optomechanical droplets. We show that these droplets could be used to measure the acceleration of
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We show that a Bose–Einstein Condensate illuminated by a far off-resonant optical pump field and its retroreflection from a feedback mirror can produce stable, localised structures known as optomechanical droplets. We show that these droplets could be used to measure the acceleration of a BEC via continuous monitoring of the position of the droplet via the optical intensity distribution.
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(This article belongs to the Special Issue Cold and Rydberg Atoms for Quantum Technologies)
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Open AccessArticle
Prospective Optical Lattice Clocks in Neutral Atoms with Hyperfine Structure
by
Tobias Bothwell
Atoms 2024, 12(3), 14; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12030014 - 05 Mar 2024
Abstract
Optical lattice clocks combine the accuracy and stability required for next-generation frequency standards. At the heart of these clocks are carefully engineered optical lattices tuned to a wavelength where the differential AC Stark shift between ground and excited states vanishes—the so called ‘magic’
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Optical lattice clocks combine the accuracy and stability required for next-generation frequency standards. At the heart of these clocks are carefully engineered optical lattices tuned to a wavelength where the differential AC Stark shift between ground and excited states vanishes—the so called ‘magic’ wavelength. To date, only alkaline-earth-like atoms utilizing clock transitions with total electronic angular momentum have successfully realized these magic wavelength optical lattices at the level necessary for state-of-the-art clock operation. In this article, we discuss two additional types of clock transitions utilizing states with , leveraging hyperfine structure to satisfy the necessary requirements for controlling lattice-induced light shifts. We propose realizing (i) clock transitions between same-parity clock states with total angular momentum and (ii) M1/E2 clock transitions between a state with and a second state with , . We present atomic species which fulfill these requirements before giving a detailed discussion of both manganese and copper, demonstrating how these transitions provide the necessary suppression of fine structure-induced vector and tensor lattice light shifts for clock operations. Such realization of alternative optical lattice clocks promises to provide a rich variety of new atomic species for neutral atom clock operation, with applications from many-body physics to searches for new physics.
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(This article belongs to the Special Issue High-Precision Laser Spectroscopy)
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Open AccessArticle
Energy Levels and Transition Data of Cs VI
by
Abid Husain, Haris Kunari and Tauheed Ahmad
Atoms 2024, 12(3), 13; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12030013 - 27 Feb 2024
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Previously reported atomic data (spectral lines, wavelengths, energy levels, and transition probabilities) were collected and systematically analyzed for Cs VI. The present theoretical analysis was supported by extensive calculations made for Cs VI with a pseudo-relativistic Hartree–Fock (HFR) method together with the superposition
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Previously reported atomic data (spectral lines, wavelengths, energy levels, and transition probabilities) were collected and systematically analyzed for Cs VI. The present theoretical analysis was supported by extensive calculations made for Cs VI with a pseudo-relativistic Hartree–Fock (HFR) method together with the superposition of configuration interactions implemented in Cowan’s codes. In this work, all previously reported energy levels and their (allowed) transition assignments were confirmed. A critically evaluated set of optimized energy levels with their uncertainties, observed and Ritz wavelengths along with their uncertainties, and theoretical transition probabilities with their estimated uncertainties were presented in the compilation. In addition to this, we determined the radiative transition parameters for several forbidden lines within the ground configuration of Cs VI.
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Open AccessTutorial
Long-Lived Levels in Multiply and Highly Charged Ions
by
Elmar Träbert
Atoms 2024, 12(3), 12; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12030012 - 23 Feb 2024
Abstract
Atoms and ions remain in some long-lived excited levels for much longer than in typical “normal” levels, but not forever. Various cases of this so-called metastability that occur in multiply or even highly charged ions are discussed in a tutorial review, as well
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Atoms and ions remain in some long-lived excited levels for much longer than in typical “normal” levels, but not forever. Various cases of this so-called metastability that occur in multiply or even highly charged ions are discussed in a tutorial review, as well as examples of atomic lifetime measurements on such levels, their intentions, and some present and future applications.
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(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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Open AccessArticle
Fe
by
Shilpa Shajan, Kandasamy Thirunavukkarsu, Vijayanand Chandrasekaran, Venkatesan S. Thimmakondu and Krishnan Thirumoorthy
Atoms 2024, 12(2), 11; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12020011 - 18 Feb 2024
Abstract
The singlet, triplet, and quintet electronic states of the Fe system are theoretically explored using quantum chemical methods, and 39 isomers are identified in the singlet electronic state and 4 isomers in both triplet and quintet electronic
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The singlet, triplet, and quintet electronic states of the Fe system are theoretically explored using quantum chemical methods, and 39 isomers are identified in the singlet electronic state and 4 isomers in both triplet and quintet electronic states. A molecule with a planar tetracoordinate iron (ptFe) is found on the potential energy surface of singlet and triplet electronic states. The bonding features of ptFe in the singlet electronic state are analyzed with natural bond orbital (NBO) analysis, adaptive natural density partitioning (AdNDP), and molecular orbital analysis. The resultant data delineate that the ptFe is stabilized through electron delocalization in the ptFe system.
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(This article belongs to the Section Quantum Chemistry, Computational Chemistry and Molecular Physics)
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Open AccessArticle
Optical Extreme Learning Machines with Atomic Vapors
by
Nuno A. Silva, Vicente Rocha and Tiago D. Ferreira
Atoms 2024, 12(2), 10; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12020010 - 06 Feb 2024
Abstract
Extreme learning machines explore nonlinear random projections to perform computing tasks on high-dimensional output spaces. Since training only occurs at the output layer, the approach has the potential to speed up the training process and the capacity to turn any physical system into
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Extreme learning machines explore nonlinear random projections to perform computing tasks on high-dimensional output spaces. Since training only occurs at the output layer, the approach has the potential to speed up the training process and the capacity to turn any physical system into a computing platform. Yet, requiring strong nonlinear dynamics, optical solutions operating at fast processing rates and low power can be hard to achieve with conventional nonlinear optical materials. In this context, this manuscript explores the possibility of using atomic gases in near-resonant conditions to implement an optical extreme learning machine leveraging their enhanced nonlinear optical properties. Our results suggest that these systems have the potential not only to work as an optical extreme learning machine but also to perform these computations at the few-photon level, paving opportunities for energy-efficient computing solutions.
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(This article belongs to the Section Cold Atoms, Quantum Gases and Bose-Einstein Condensation)
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Open AccessFeature PaperArticle
Electron Capture from Molecular Hydrogen by Metastable Sn2+* Ions
by
Klaas Bijlsma, Lamberto Oltra, Emiel de Wit, Luc Assink, Ismanuel Rabadán, Luis Méndez and Ronnie Hoekstra
Atoms 2024, 12(2), 9; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12020009 - 01 Feb 2024
Abstract
Over a wide and partly overlapping energy range, the single-electron capture cross-sections for collisions of metastable ( ) ions with molecules were measured (0.1–10
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Over a wide and partly overlapping energy range, the single-electron capture cross-sections for collisions of metastable ( ) ions with molecules were measured (0.1–10 keV) and calculated (0.3–1000 keV). The semi-classical calculations use a close-coupling method on a basis of electronic wavefunctions of the (SnH2)2+ system. The experimental cross-sections were extracted from double collisions in a crossed-beam experiment of with . The measured capture cross-sections for show good agreement with the calculations between 2 and 10 keV, but increase toward lower energies, whereas the calculations decrease. Additional Landau–Zener calculations were performed and show that the inclusion of spin-orbit splitting cannot explain the large cross-sections at the lowest energies which we now assume to be likely due to vibrational effects in the molecular hydrogen target.
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(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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Open AccessReview
Progress in High-Precision Mass Measurements of Light Ions
by
Edmund G. Myers
Atoms 2024, 12(2), 8; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12020008 - 26 Jan 2024
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Significant advances in Penning trap measurements of atomic masses and mass ratios of the proton, deuteron, triton, helion, and alpha-particle have occurred in the last five years. These include a measurement of the mass of the deuteron against 12C with 8.5 ×
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Significant advances in Penning trap measurements of atomic masses and mass ratios of the proton, deuteron, triton, helion, and alpha-particle have occurred in the last five years. These include a measurement of the mass of the deuteron against 12C with 8.5 × 10−12 fractional uncertainty; resolution of vibrational levels of H2+ as mass and the application of a simultaneous measurement technique to the H2+/D+ cyclotron frequency ratio, yielding a deuteron/proton mass ratio at 5 × 10−12; new measurements of HD+/3He+, HD+/T+, and T+/3He+ leading to a tritium beta-decay Q-value with an uncertainty of 22 meV, and atomic masses of the helion and triton at 13 × 10−12; and a new measurement of the mass of the alpha-particle against 12C at 12 × 10−12. Some of these results are in strong disagreement with previous values in the literature. Their impact in determining a precise proton/electron mass ratio and electron atomic mass from spectroscopy of the HD+ molecular ion is also discussed.
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Open AccessArticle
Nanoparticle Interferometer by Throw and Catch
by
Jakub Wardak, Tiberius Georgescu, Giulio Gasbarri, Alessio Belenchia and Hendrik Ulbricht
Atoms 2024, 12(2), 7; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12020007 - 25 Jan 2024
Abstract
Matter wave interferometry with increasingly larger masses could pave the way to understanding the nature of wavefunction collapse, the quantum to classical transition, or even how an object in a spatial superposition interacts with its gravitational field. In order to improve upon the
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Matter wave interferometry with increasingly larger masses could pave the way to understanding the nature of wavefunction collapse, the quantum to classical transition, or even how an object in a spatial superposition interacts with its gravitational field. In order to improve upon the current mass record, it is necessary to move into the nanoparticle regime. In this paper, we provide a design for a nanoparticle Talbot–Lau matter wave interferometer that circumvents the practical challenges of previously proposed designs. We present numerical estimates of the expected fringe patterns that such an interferometer would produce, considering all major sources of decoherence. We discuss the practical challenges involved in building such an experiment, as well as some preliminary experimental results to illustrate the proposed measurement scheme. We show that such a design is suitable for seeing interference fringes with amu SiO2 particles and that this design can be extended to even amu particles by using flight times below the typical Talbot time of the system.
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(This article belongs to the Special Issue Advances in and Prospects for Matter Wave Interferometry)
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Open AccessArticle
New Data on Autoionizing States of Ne Induced by Low-Energy Electrons from 45 to 64 eV
by
Jozo J. Jureta, Bratislav P. Marinković and Lorenzo Avaldi
Atoms 2024, 12(2), 6; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12020006 - 23 Jan 2024
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The lowest single and doubly excited autoionizing states of neon have been studied using a non-monochromatic electron beam and a high-resolution electrostatic analyzer at incident electron energies from 43.37 to 202 (±0.4) eV at three ejection angles, 40°, 90° and 130°. The 2s2p
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The lowest single and doubly excited autoionizing states of neon have been studied using a non-monochromatic electron beam and a high-resolution electrostatic analyzer at incident electron energies from 43.37 to 202 (±0.4) eV at three ejection angles, 40°, 90° and 130°. The 2s2p63s(3,1S) and 2s2p63p(3,1P) as well as the 2p43s3p doubly excited states have been observed and their energy determined. The influence of the PCI effect in the energy region of the 2s2p63s(3,1S) states has been investigated. New features in the ejected electron spectra in the low kinetic energy region 3–20 eV at 202 eV incident energy have been observed and assigned.
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Open AccessArticle
Calculation of the Differential Breit-Rosenthal Effect in Pb
by
Martin Kinden Karlsen and Jonas R. Persson
Atoms 2024, 12(1), 5; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12010005 - 16 Jan 2024
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Recent advancements in studying long chains of unstable nuclei have revitalised interest in investigating the hyperfine anomaly. Hyperfine anomaly is particularly relevant for determining nuclear magnetic dipole moments using hyperfine structures where it limits the accuracy. This research paper focuses on the calculation
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Recent advancements in studying long chains of unstable nuclei have revitalised interest in investigating the hyperfine anomaly. Hyperfine anomaly is particularly relevant for determining nuclear magnetic dipole moments using hyperfine structures where it limits the accuracy. This research paper focuses on the calculation of the differential Breit-Rosenthal effect for the , and states in Pb, utilising the multi-configurational Dirac-Hartree-Fock code, GRASP2018. The findings show that the differential Breit-Rosenthal effect is typically less than , which is often much smaller than the Bohr-Weisskopf effect. The differential Breit-Rosenthal effect for the state is one order of magnitude smaller than the rest, which is why this state seems to be insensible to the hyperfine anomaly.
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Open AccessArticle
Energy Shift of the Atomic Emission Lines of He-like Ions Subject to Outside Dense Plasma
by
Tu-Nan Chang, Te-Kuei Fang, Rui Sun, Chensheng Wu and Xiang Gao
Atoms 2024, 12(1), 4; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12010004 - 15 Jan 2024
Abstract
We present an extension of our study of the energy shift of the atomic emissions subject to charged-neutral outside dense plasma following the good agreement between the experimental measurements and our recent theoretical estimates for the and emission lines of a
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We present an extension of our study of the energy shift of the atomic emissions subject to charged-neutral outside dense plasma following the good agreement between the experimental measurements and our recent theoretical estimates for the and emission lines of a number of H-like and He-like ions. In particular, we are able to further demonstrate that the plasma-induced transition energy shift could indeed be interpolated by the simple quasi-hydrogenic picture based on the application of the Debye–Hückel (DH) approximation for the to transitions of the He-like ions. Our theoretically estimated redshifts of those emissions may offer the impetus for additional experimental measurement to facilitate the diagnostic efforts in the determination of the temperature and density of the dense plasma.
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(This article belongs to the Special Issue Atomic Physics in Dense Plasmas)
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Open AccessArticle
Basis Set Calculations of Heavy Atoms
by
Mikhail G. Kozlov, Yuriy A. Demidov, Mikhail Y. Kaygorodov and Elizaveta V. Tryapitsyna
Atoms 2024, 12(1), 3; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12010003 - 12 Jan 2024
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Most modern calculations of many-electron atoms use basis sets of atomic orbitals. An accurate account for electronic correlations in heavy atoms is a very difficult computational problem, and an optimization of the basis sets can reduce computational costs and increase final accuracy. Here,
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Most modern calculations of many-electron atoms use basis sets of atomic orbitals. An accurate account for electronic correlations in heavy atoms is a very difficult computational problem, and an optimization of the basis sets can reduce computational costs and increase final accuracy. Here, we propose a simple differential ansatz to form virtual orbitals from the Dirac–Fock orbitals of the core and valence electrons. We use basis sets with such orbitals to calculate different properties in Cs including hyperfine structure constants and QED corrections to the valence energies and to the transition amplitudes.
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Open AccessArticle
R-Matrix Calculation of Electron Collision with the BeO+ Molecular Ion
by
Nilanjan Mukherjee, Abhijit Bhattacharyya and Kalyan Chakrabarti
Atoms 2024, 12(1), 2; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12010002 - 10 Jan 2024
Abstract
We report here an R-matrix study of electron collision with the BeO molecular ion in its X ground state and at a single bond length, namely its equilibrium . Firstly, a good
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We report here an R-matrix study of electron collision with the BeO molecular ion in its X ground state and at a single bond length, namely its equilibrium . Firstly, a good quality configuration interaction calculation is performed for the BeO ground and excited states. We then perform scattering calculations using the R-matrix method to yield the cross-section for electronic excitation to several of its excited states. The electron impact dissociation of BeO through the two lowest dissociation channels, namely the Be + O and Be + O dissociation channels, is estimated using the electronic excitation cross-sections. Rotational excitation cross-sections are provided for the rotational transitions. Our calculations also yield e + BeO neutral Feshbach resonances and their widths which we present systematically categorized by their symmetry and quantum defects, and BeO-bound Rydberg states at the BeO equilibrium. The full potential energy curves for the resonant states, their widths and the bound Rydberg states, whose details we propose to give in a subsequent work, can be the starting point of other collision calculations.
Full article
(This article belongs to the Special Issue Calculations and Measurements of Atomic and Molecular Collisions)
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Open AccessArticle
Better Understanding of Hydrogen Pellet Ablation Cloud Spectra through the Occupation Probability Formalism in LHD
by
Motoshi Goto, Gen Motojima, Ryuichi Sakamoto, Bernard Pégourié, Akinobu Matsuyama, Tetsutarou Oishi, Tomoko Kawate and Yasuko Kawamoto
Atoms 2024, 12(1), 1; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms12010001 - 08 Jan 2024
Abstract
We have recently incorporated the occupation probability formalism (OPF) in the simulation model [C. Stehlé and S. Jacquemot, Astron. Astrophys. 271, 348 (1993)] to have a smooth transition from discrete lines to continuum spectrum in the wavelength range near the Balmer
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We have recently incorporated the occupation probability formalism (OPF) in the simulation model [C. Stehlé and S. Jacquemot, Astron. Astrophys. 271, 348 (1993)] to have a smooth transition from discrete lines to continuum spectrum in the wavelength range near the Balmer series limit. We have analyzed spectra measured for the hydrogen pellet ablation cloud in the Large Helical Device with the revised model, and have found that the electron density in the ablation cloud has a close correlation with the electron temperature of the background plasma. This type of correlation is first confirmed in the present analysis and should give a new insight in the simulation studies of pellet ablation for the magnetically confined fusion plasma.
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(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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