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63 papers · 1 filter
Second-Order Rayleigh-Schrödinger Perturbation Theory for the Grasp
G. Gaigalas, P. Rynkun, L. Kitovienė
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 import…
Second-Order Rayleigh-Schrödinger Perturbation Theory for the GRASP2018 Package: Three-Particle Feynman Diagram Contribution to Core-Valence Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė
In order to ascertain the precise atomic characteristics, it is important to incorporate a wide range of electron correlations in the computational analysis. However, it is importa…
Second-Order Rayleigh-Schrödinger Perturbation Theory for the GRASP2018 Package: Three-Particle Feynman Diagram Contribution to Valence-Valence Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė
The method based on the second-order perturbation theory to identify the most important configuration state functions of the various correlations is extended to include valence-val…
Second-Order Rayleigh-Schrödinger Perturbation Theory for the GRASP2018 Package: Core-Core Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė
Grasp package is based on the relativistic configuration interaction in which accurate calculations, accounting for valence, valence-valence, core-valence, core, and core-core elec…
Second-Order Rayleigh-Schrödinger Perturbation Theory for the GRASP2018 Package: Core Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė
The paper presents a further development of the method G. Gaigalas, P. Rynkun, L. Kitovienė, Second-Order of Rayleigh-Schrödinger Perturbation Theory for the {\sc Grasp}2018 Packag…
Second-order Rayleigh-Schrödinger Perturbation Theory for the {\sc Grasp}2018 Package: Core-valence Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė
The General Relativistic Atomic Structure package [{\sc Grasp}2018, C. Froese Fischer, G. Gaigalas, P. Jönsson, J. Bieroń, Comput. Phys. Commun. (2019), DOI: 10.1016/j.cpc.2018.10.…
Atomic data benchmarked by Large-scale Multiconfiguration Dirac-Hartree-Fock Calculations for Beryllium
Sijie Wu, Shaowei Tian, Ran Si +6
The multiconfiguration Dirac-Hartree-Fock (MCDHF) and relativistic configuration interaction (RCI) methods are used to provide excitation energies, radiative transition data, lifet…
In situ magnetic-field stabilization for quantum-gas experiments
E. Gvozdiovas, A. Valdés-Curiel, Q. -Y. Liang +6
We demonstrate a minimally-destructive in situ technique for measuring and stabilizing slowly-drifting magnetic fields in ultracold-atom experiments. While conventional magnetic-fi…
Graspg -- An extension to Grasp2018 based on Configuration State Function Generators
Ran Si, Yanting Li, Kai Wang +4
The Graspg program package is an extension of Grasp2018 [Comput. Phys. Commun. 237 (2019) 184-187] based on configuration state function generators (CSFGs). The generators keep spi…
Probing new bosons and nuclear structure with ytterbium isotope shifts
Menno Door, Chih-Han Yeh, Matthias Heinz +24
In this Letter, we present mass-ratio measurements on highly charged Yb ions with a precision of and isotope-shift measurements on Yb on the …
Four-body system of atoms: Dimer-dimer scattering
A. Deltuva
The strong short-range repulsion, characteristic to realistic interatomic potentials, complicates the description of weakly-bound few-body systems such as those of \He atoms. The p…
electronic factors of the and hyperfine structure constants for the states in Sn I
Asimina Papoulia, Sacha Schiffmann, Jacek Bieroń +7
Large-scale calculations of the electric field gradient, which constitutes the electronic contribution to the electric quadrupole hyperfine constant , were…
Strongly confined atomic localization by Rydberg coherent population trapping
Teodora Kirova, Ning Jia, Seyyed Hossein Asadpour +3
In this letter we investigate the possibility to attain strongly confined atomic localization using interacting Rydberg atoms in a Coherent Population Trapping (CPT) ladder configu…
A Weakly-Interacting Many-Body System of Rydberg Polaritons Based on Electromagnetically Induced Transparency
Bongjune Kim, Ko-Tang Chen, Shih-Si Hsiao +9
We proposed utilizing a medium with a high optical depth (OD) and a Rydberg state of low principal quantum number, , to create a weakly-interacting many-body system of Rydberg p…
Large-scale multiconfiguration Dirac-Hartree-Fock calculations for astrophysics: n=4 levels in P-like ions from Mn~XI to Ni~XIV
C. X. Song, K. Wang, G. Del Zanna +9
Using the multiconfiguration Dirac-Hartree-Fock and the relativistic configuration interaction methods, a consistent set of transition energies and radiative transition data for th…
Extended calculations of energy levels and transition rates for singly ionized lanthanide elements I: Pr - Gd
Laima Radžiūtė, Gediminas Gaigalas, Daiji Kato +2
Lanthanide elements play important roles as an opacity source in the ejected material from neutron star mergers. Accurate and complete atomic data are necessary to evaluate the opa…
Energy level structure and transition data of Er
Gediminas Gaigalas, Pavel Rynkun, Laima Radžiūtė +3
The main aim of this paper is to present accurate energy levels of the ground [Xe] and first excited [Xe] configurations of Er. The energy level structur…
Effect of laser frequency fluctuation on the decay rate of Rydberg coherence
Bongjune Kim, Ko-Tang Chen, Chia-Yu Hsu +8
The effect of electromagnetically induced transparency (EIT) combined with Rydberg-state atoms provides high optical nonlinearity to efficiently mediate the photon-photon interacti…
How to dress radio-frequency photons with tunable momentum
Boris Shteynas, Jeongwon Lee, Furkan C. Top +4
We demonstrate how the combination of oscillating magnetic forces and radio-frequency (RF) pulses endows RF photons with tunable momentum. We observe velocity-selective spinflip tr…
Azimuthal modulation of electromagnetically induced transparency using structured light
Hamid Reza Hamedi, Viaceslav Kudriašov, Julius Ruseckas +1
Recently a scheme has been proposed for detection of the structured light by measuring the transmission of a vortex beam through a cloud of cold rubidium atoms with energy levels o…
Ab initio calculations of hyperfine structures of zinc and evaluation of the nuclear quadrupole moment
Jacek Bieroń, Livio Filippin, Gediminas Gaigalas +3
The relativistic multiconfiguration Dirac-Hartree-Fock (MCDHF) and the non-relativistic multiconfiguration Hartree-Fock (MCHF) methods have been employed to calculate the magnetic…
Energy Levels, Lifetimes and Transition rates for P-like ions from Cr X to Zn XVI from large-scale Relativistic Multiconfiguration Calculations
K. Wang, P. Jönsson, G. Gaigalas +4
The fully relativistic multiconfiguration Dirac--Hartree--Fock method is used to compute excitation energies and lifetimes for the 143 lowest states of the , , $3…
Multiconfiguration calculations of electronic isotope shift factors in Zn I
Livio Filippin, Jacek Bieroń, Gediminas Gaigalas +2
The present work reports results from systematic multiconfiguration Dirac-Hartree-Fock calculations of electronic isotope shift factors for a set of transitions between low-lying s…
Irreducible tensor form for the AME coupling
Rytis Jursenas
Using the multipole expansion of electromagnetic (EM) field, we present the angular magnetoelectric (AME) coupling in irreducible tensor form. We evaluate the matrix elements when…