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ISSN 2218-2004 · MDPI AG · 1.065 artikel di indeks
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Artikel Jurnal Teks lengkap
Theoretical Calculation of Caq+ (q = 0, 1, 2) Interacting with a Krypton Atom: Electronic Structure and Vibrational Spectra Association
The potential energy curves and spectroscopic constants of the ground and several low-lying excited states of the Caq+-Kr (q = 0, 1, 2) van der Waals complexes were investigated using one- and two-electron pseudopotential approaches. This treatment effectively reduces the number of active electrons…
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Calculation of Hyperfine Structure in Tm ii
The first measurements of the magnetic dipole hyperfine structure constants A in singly ionized thulium revealed substantial discrepancies with the corresponding theoretical calculations. Subsequent measurements expanded the very limited available dataset and demonstrated that two of the previously…
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Search for Possible Stable Structures in the Tccq¯s¯ System
Inspired by the well-known experimental connections between X(3872), Zcs(4220), and Y(4620), we systematically study the recently reported strange partner of Tcc, the 1+ccq¯s¯ system, and its orbital excitation state 1−ccq¯s¯. A chiral quark model incorporating SU(3) symmetry is considered to study…
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Artikel Jurnal Teks lengkap
Invariant Approach to the Interaction Between Several Fields and an Atom
We present a general procedure to describe the dynamics of N degenerate quantized fields interacting resonantly with a two–level atom, all coupled with the same strength, within the rotating–wave approximation. Starting from the analysis of the two and three field cases, we generalize the method by…
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Artikel Jurnal Teks lengkap
L-Shell Photon Excitation Cross Sections for the Chlorine Isonuclear Sequence Clq+ (q=1−4): An Experimental Study
We report experimental measurements of the absolute photoionization cross sections for chlorine ions in different stages of ionization, over photon energy ranges corresponding to the L-shell (2s and 2p subshells) excitations. Single, double and triple photoionization channels were investigated for…
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Application of Extended Dirac Equation to Photon–Electron Interactions and Electron–Positron Collision Processes: A Quantum Theoretical Approach Using a 256 × 256 Matrix Representation
We propose a novel theoretical framework for describing photon–electron interactions and electron collision processes in a unified manner within quantum electrodynamics. Specifically, we develop a method to construct the Dirac operator in curved spacetime using only matrix representations rooted in…
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NBODYCL: A Program to Generate Regularized Classical Trajectories for the n–Body Coulomb Problem
A program package for calculating regularized classical trajectories for Coulomb n–body problem is developed. The Coulomb singularities from the equations of motion are removed by transformations of variables including the time. This effectively conserves the energy of the time-independent systems…
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Study of the Triplet States in the Autoionizing Electron Spectra of He and Ar Induced by Low-Energy Electrons
In this work, the He and Ar triplet autoionizing states have been studied using a non-monochromatic electron beam and a high-resolution electrostatic analyzer at low incident electron energies and three ejection angles: 40°, 90°, and 130°. Low-energy electrons have been used because they have a…
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Two-Atom Superradiance Including Magnetic State Degeneracy
The radiation pattern emitted by two atoms, interacting with each other via the vacuum radiation field, has been calculated, including effects of magnetic state degeneracy for atoms with a ground state having G=0 angular momentum and an excited state having H=1 angular momentum. For an initial…
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Artikel Jurnal Teks lengkap
Influence of End Cap Structure on the Axial Geometric Parameter of the Linear Paul Trap
Through finite-element simulation, the axial potential distribution of the ion trap is analyzed. The effects of the central hole diameter of the end cap and the spacing between the two end caps on the axial geometric parameters of the ion trap are investigated. Based on these findings, a set of…
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Artikel Jurnal Teks lengkap
Dielectronic Recombination Strengths and Plasma Rate Coefficients of Lithium-like Argon Ions: Theory and Experiment
Dielectronic recombination (DR) is widely recognized as a fundamental atomic process in many astrophysical and laboratory plasmas, where it plays a crucial role in determining ionization balance and level populations over a broad temperature range. Reliable DR resonance strengths and plasma rate…
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Two-Center Repulsive Coulomb System in a Constant Magnetic Field
We study the planar repulsive two-center Coulomb system in the presence of a uniform magnetic field perpendicular to the plane, taking the inter-center separation a and the magnetic field strength B as independent control parameters. The free-field system B=0 is Liouville integrable and the motion…
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The Winds, UV Line Blanketing, Rotational Velocities and Mass Loss Rate of the Hot, Contact Binary Star TU Muscae (HD 100213)
An empirical model of the TU Muscae binary star system has been developed by a study of 23 high resolution SWP spectrophotometric images that were obtained with the International Ultraviolet Explorer (IUE) satellite telescope including some that were downloaded from the NASA/MAST IUE Archive. The…
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Atomic Data for Yb-like Ions from Ta IV to Pt IX Relevant to Tungsten Transmutation in Fusion Plasmas
Accurate atomic data for heavy ions are required for spectroscopic diagnostics and impurity transport modeling in magnetic-confinement fusion devices, particularly for tungsten and its neutron-induced transmutation products. In the present work, we investigate the ytterbium-like ions Ta IV, W V, Re…
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Instrument Development for Lunar Interior Investigation Using Atom Interferometry
The Atomic Lunar Seismometer (ALS) is an atom-interferometer instrument concept for measuring the lunar gravity and vibration modes at long time scales. Compared to other seismometer techniques, atom interferometers offer a pathway toward an ultra-low drift seismometer for signals around and below…
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Study of the Hyperfine Structure of the Low-Lying Ca II and Ra I–II Levels: Applying the MCDHF Models Developed for Ba I–II
Building on our previous multi-configuration Dirac–Hartree–Fock (MCDHF) computational strategies tailored for the hyperfine structure (HFS) of low-lying levels in one-valence electron Sr II and Ba II ions and in two-valence electrons in a Ba I atom, we successfully extend these methodologies along…
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Recent Progress in Ab Initio Nuclear Theory for Precision Physics Searches in Muonic Atoms and Superallowed β Decays
Precision tests of the Standard Model at low energy are increasingly limited by nuclear-structure theory rather than by experiments. We review two such cases: the two-photon-exchange correction to the Lamb shift in muonic atoms, and the γW box radiative correction to superallowed β decays. Although…
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Construction of Intrinsically Screened Heavy-Particle Potentials in Dense Plasmas from First-Principles Pseudopotentials
We present a computational framework for constructing effective, intrinsically screened heavy-particle potentials in dense plasmas from first-principles pseudopotentials. Starting from available projector-augmented-wave (PAW) data in the Unified Pseudopotential Format (UPF), the…
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High-Precision Measurement of the Landé gJ-Factor of the 2D3/2 State in the 171Yb+ Ion
In this work, we report a high-precision experimental determination of the ratio gF,D/gF,S=0.998060(5) between the Landé g-factors for states S1/22(F=1) and D3/22(F=1) in 171Yb+. Together with the recently calculated g-factor of the S1/22 state g(S1/2)=2.002615(70), this yields a value of…
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Artikel Jurnal Teks lengkap
Second-Order Rayleigh–Schrödinger Perturbation Theory for the Grasp2018 Package
A developed method, based on the stationary second-order Rayleigh–Schrödinger many-body perturbation theory in an irreducible tensorial form, allows us to determine the most important core–valence, core, core–core, and valence–valence correlations for any atom or ion with an arbitrary number of…
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