166 citations · 596 across the 25 of their papers we have counts for
25 papers
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: Valence-Valence Correlations
G. Gaigalas, P. Rynkun, L. Kitovienė
The accurate description of electron correlations remains a major challenge in atomic calculations. In order to perform accurate calculations, it is necessary to consider the vario…
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.…
Theoretical study of Th III energy levels and transitions for applications to kilonova spectra
Laima Kitovienė, Gediminas Gaigalas, Pavel Rynkun +3
The neutron star merger is a promising site of heavy element production. By producing heavy elements, the neutron star merger gives rise to a thermal transient called a kilonova. S…
Systematic opacity calculations for kilonovae -- II. Improved atomic data for singly ionized lanthanides
Daiji Kato, Masaomi Tanaka, Gediminas Gaigalas +2
Lanthanides play most important roles in the opacities for kilonova, ultraviolet-optical-infrared emission from neutron star mergers. Although several efforts have been made to con…
Theoretical investigation of energy levels and transitions for Ce III with applications to kilonova spectra
G. Gaigalas, P. Rynkun, N. Domoto +3
Doubly ionized cerium (Ce) is one of the most important ions to understand the kilonova spectra. In particular, near-infrared (NIR) transitions of Ce III between the ground…
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…
Extended calculations of energy levels and transition rates of Nd II-IV ions for application to neutron star mergers
Gediminas Gaigalas, Daiji Kato, Pavel Rynkun +2
Coalescence of binary neutron star give rise to electromagnetic emission, kilonova, powered by radioactive decays of r-process nuclei. Observations of kilonova associated with GW17…
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…
Properties of Kilonovae from Dynamical and Post-Merger Ejecta of Neutron Star Mergers
Masaomi Tanaka, Daiji Kato, Gediminas Gaigalas +8
Ejected material from neutron star mergers give rise to electromagnetic emission powered by radioactive decays of r-process nuclei, which is so called kilonova or macronova. While…
Theoretical investigation of spectroscopic properties of
A. Alkauskas, P. Rynkun, G. Gaigalas +6
Energy levels and emission spectra of ion have been studied by performing the large-scale relativistic configuration interaction calculations. Configuration interaction s…
Cascade emission in electron beam ion trap plasma of W ion
V. Jonauskas, T. Pütterich, S. Kučas +7
Spectra of the W ion are studied using the collisional-radiative model (CRM) with an ensuing cascade emission. It is determined that the cascade emission boosts intensities…
Theoretical investigation of spectroscopic properties of W in EBIT plasma
V. Jonauskas, A. Kynienė, P. Rynkun +6
Energy levels, radiative transition wavelengths and probabilities have been studied for the W ion using multiconfiguration Dirac-Fock and Dirac-Fock-Slater methods. Corona…
Contribution of high-nl shells to electron-impact ionization processes
V. Jonauskas, A. Kynienė, G. Merkelis +6
The contribution to electron-impact ionization cross sections from excitations to high-nl shells and a consequent autoionization is investigated. We perform relativistic subconfigu…
Hyperfine structures and Landé -factors for states in beryllium-, boron-, carbon-, and nitrogen-like ions from relativistic configuration interaction calculations
S. Verdebout, C. Nazé, P. Jönsson +3
Energy levels, hyperfine interaction constants, and Landé -factors are reported for n=2 states in beryllium-, boron-, carbon-, and nitrogen-like ions from relativistic configu…
Isotope Shifts in Beryllium-, Boron-, Carbon-, and Nitrogen-like Ions from Relativistic Configuration Interaction Calculations
C. Nazé, S. Verdebout, P. Rynkun +3
Energy levels, normal and specific mass shift parameters as well as electronic densities at the nucleus are reported for numerous states along the beryllium, boron, carbon, and nit…
Toward Calculations with Spectroscopic Accuracy: the 2s2.2p 2Po_{3/2} - 2s2p2 4P_{5/2} Excitation Energy in Boron
Charlotte Froese Fischer, Simon Verdebout, Michel Godefroid +3
No lines have been observed for transitions between the doublet and quartet levels of B I. Consequently, energy levels based on observation for the latter are obtained through extr…
A Partitioned Correlation Function Interaction approach for describing electron correlation in atoms
S. Verdebout, P. Rynkun, P. Jönsson +3
Traditional multiconfiguration Hartree-Fock (MCHF) and configuration interaction (CI) methods are based on a single orthonormal orbital basis (OB). For atoms with complicated shell…