Energy Level Structure and Transition Data of Er2

Gaigalas, GediminasInstitute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio Ave. 3, Lithuania (författare)

Energy Level Structure and Transition Data of Er2+

A majority of Er in the universe is synthesized by the r-process, which can occur in the mergers of neutron stars (NSs). The contribution of this element to the opacity of NS ejecta should be tested, but even the energy levels of first excited configuration have not been fully presented. The main aim of this paper is to present accurate energy levels of the ground [Xe]4f(12) and first excited [Xe]4f(11)5d configurations of Er2+. The energy level structure of the Er2+ ion was computed using the multiconfiguration Dirac-Hartree-Fock and relativistic configuration interaction (RCI) methods, as implemented in the GRASP2018 program package. The Breit interaction, self-energy, and vacuum polarization corrections were included in the RCI computations. The zero-first-order approach was used in the computations. Energy levels with the identification in LS coupling for all (399) states belonging to the [Xe]4f(12) and [Xe]4f(11)5d configurations are presented. Electric dipole (E1) transition data between the levels of these two configurations are computed. The accuracy of these data is evaluated by studying the behavior of the transition rates as functions of the gauge parameter, as well as by evaluating the cancellation factors. The core electron correlations were studied using different strategies. The rms deviations obtained in this study for states of the ground and excited configurations from the available experimental data are 649 and 754 cm(-1), respectively.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
Atomic spectroscopy
Radiative transfer
Stellar atmospheric opacity
Transition probabilities
Chemically peculiar stars
Neutron stars

Rynkun, PavelInstitute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio Ave. 3, Lithuania (författare)
Radziute, LaimaInstitute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio Ave. 3, Lithuania (författare)
Kato, DaijiNational Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan; Department of Advanced Energy Engineering Science, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan (författare)
Tanaka, MasaomiAstronomical Institute, Tohoku University, Sendai, 980-8578, Japan (författare)
Jönsson, PerMalmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM)(Swepub:mau)tspejo (författare)
Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio Ave. 3, LithuaniaNational Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan; Department of Advanced Energy Engineering Science, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan (creator_code:org_t)

Ingår i:Astrophysical Journal Supplement Series: Institute of Physics Publishing (IOPP)248:10067-00491538-4365

Av författaren/redakt...: Gaigalas, Gedimi ...; Rynkun, Pavel; Radziute, Laima; Kato, Daiji; Tanaka, Masaomi; Jönsson, Per

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