Analysis of the core polarization effects in the calculated atomic parameters of Hg iii

2020 ◽  
Vol 493 (1) ◽  
pp. 288-298
Author(s):  
I de Andrés-García ◽  
C Colón
Keyword(s):  
Stark Effect ◽  
Transition Probabilities ◽  
Stellar Atmosphere ◽  
Spectral Lines ◽  
Oscillator Strengths ◽  
Electron Collision ◽  
Core Polarization ◽  
Polarization Effects ◽  
The Core ◽  
Starting Point

ABSTRACT The presence of Hg iii in the stellar atmosphere in the stars HgMn χ Lupi and HR7775 was reported by Leckrone et al. and Proffitt et al. In this last work, the authors indicate that the intensities of the spectral lines of 1360.50, 1647.48, and 1738.54 Å of Hg iii are relatively strong compared to the intensities of the spectral lines of Hg ii. Although the explanation given by the authors in their conclusions should be correct, the values of the oscillator strengths used by the authors in some cases were not consistent with the experimental lifetimes obtained by Henderson et al. In addition, some of the lines studied by the authors are widely overlapped with intense lines of Hg iii of the same multiplet. In this paper, we present values of transition probabilities and line broadening by electron collision (Stark effect) of several lines of Hg iii in order to clarify the problems indicated above. Since Hg iii is a heavy element, we include the core polarization effects (using the Cowan’s code) in our calculations. Several values of polarizability, taking Fraga values for Hg iv as a starting point, have been considered in this study in order to obtain theoretical values of those parameters close to the experimental ones. The theoretical values of the lifetimes obtained in this study, close to the experimental ones, were obtained for a polarizability value of 3.5 au.

scholarly journals New Transition and Energy Levels of Three-Times Ionized Krypton (Kr IV)

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 48
Author(s):  
M. Raineri ◽  
M. Gallardo ◽  
J. Reyna Almandos ◽  
A. G. Trigueiros ◽  
C. J. B. Pagan
Keyword(s):  
Transition Probabilities ◽  
Energy Levels ◽  
Pulsed Discharge ◽  
Core Polarization ◽  
Polarization Effects ◽  
Hartree Fock ◽  
Theta Pinch ◽  
New Energy ◽  
First Time

A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time. We extended the analysis to twenty-five new energy levels belonging to 3s23p24d, 3s23p25d even configurations. We calculated weighted transition probabilities (gA) for all of the experimentally observed lines and lifetimes for new energy levels using a relativistic Hartree–Fock method, including core-polarization effects.

scholarly journals O2 State in 18 O by using Core – Polarization effects

2008 ◽  
pp. 66-72
Keyword(s):  
Perturbation Theory ◽  
Experimental Studies ◽  
Form Factors ◽  
Wave Model ◽  
Collective Model ◽  
Core Polarization ◽  
Polarization Effects ◽  
The Core ◽  
The Subject ◽  
Space Wave

Coulomb form factors for E0 transition in 18O are discussed taking into account core-polarization effects. These effects are taken into account through the collective model of Tassie and also through a microscopic perturbation theory including excitations up to 2p1f shell. Space wave model functions defined for the orbits 1 and 2125O nucleus has been the subject of extensive theoretical and experimental studies, which received much attention in last decade [Alex Brown et.al.2005]. The 18O system contains two neutrons in addition to the16O core distributed in the sd – shell. d1 are obtained from the diagonalization of the interaction Hamilonian of Wildenthal. The calculations include the 0 2state with excitation energies3.6337MeV. The core – polarization effects which incorporate the ollective model of Tassei describe the data very well for this state.

Core polarization effects on oscillator strengths in neutral zinc

1992 ◽  
Vol 45 (1) ◽  
pp. 43-48 ◽  
Author(s):  
Tomas Brage ◽  
Charlotte Froese Fischer
Keyword(s):  
Oscillator Strengths ◽  
Core Polarization ◽  
Polarization Effects

Systematic trends along the potassium sequence: Study of ns2S–mp2P0 transitions

1991 ◽  
Vol 69 (10) ◽  
pp. 1273-1283 ◽  
Author(s):  
Inmaculada Martin ◽  
Carmen Lavín ◽  
Carmen Barrientos
Keyword(s):  
Dipole Transition ◽  
Quantum Defect ◽  
Oscillator Strengths ◽  
Transition Operator ◽  
Graphical Form ◽  
Isoelectronic Sequence ◽  
Core Polarization ◽  
Polarization Effects ◽  
General Improvement ◽  
Sequence Study

The quantum defect orbital (QDO) method, with the use of a core polarization-corrected dipole transition operator, was employed to determine oscillator strengths for potassium and some of its isoelectronic ions (CaII–CrVI). The inclusion of core-valence polarization effects leads to a general improvement of the QDO f values. Systematic trends of individual oscillator strengths along the isoelectronic sequence are also shown in a graphical form.

Effects of the isoscalar and isovector interaction on the ground-state magnetic moments of odd-mass 137–145Ce nuclei

2019 ◽  
Vol 97 (11) ◽  
pp. 1187-1190
Author(s):  
H. Yakut ◽  
E. Tabar ◽  
G. Hoşgör
Keyword(s):  
Ground State ◽  
Magnetic Moments ◽  
The Other ◽  
Spin Interaction ◽  
Nuclear Model ◽  
Isotopic Chain ◽  
Core Polarization ◽  
Polarization Effects ◽  
The Core

A systematic study of the magnetic properties of deformed odd-neutron 137–145Ce isotopes using the microscopic quasiparticle phonon nuclear model (QPNM) has been presented. The QPNM includes residual spin–spin interaction in both isoscalar and isovector channels. The analysis shows that in the isoscalar channel contributions to the magnetic moment coming from the neutron and proton systems practically cancel out each other. On the other hand, in the isovector channel, the coherent contribution coming from the quasiparticle–phonon interactions leads to a spin polarization (core polarization), which is important for determination of the quenched spin gyromagnetic factors (gs). The quenched spin gyromagnetic factors so called [Formula: see text] have been found to range from [Formula: see text] to [Formula: see text] in the odd-mass 137–145Ce isotopic chain, which is similar to its phenomenological value ([Formula: see text] between [Formula: see text] and [Formula: see text]). By taking into consideration the core polarization effects, the available experimental data are satisfactorily reproduced with an accuracy of 0.01μN–0.1μN.

Core-polarization effects in the alkali atoms: oscillator-strength calculations

1986 ◽  
Vol 64 (8) ◽  
pp. 867-871 ◽  
Author(s):  
Inmaculada Martin ◽  
Carmen Barrientos
Keyword(s):  
Oscillator Strength ◽  
Dipole Transition ◽  
Quantum Defect ◽  
Oscillator Strengths ◽  
Transition Moment ◽  
Spin Orbit ◽  
Core Polarization ◽  
Polarization Effects ◽  
Alkali Atoms ◽  
Dipole Transition Moment

Oscillator strengths for the alkali group of elements have been computed through the quantum defect orbital (QDO) formalism. Three forms of the dipole transition moment have been employed, two of them accounting for core–valence polarization. Clear improvement is obtained over the nonpolarized calculations for the lighter elements, whereas for K, Rb, and Cs, the additional inclusion of spin–orbit effects is shown to be required.

Core-polarization-corrected multiconfiguration Dirac–Fock oscillator strengths and excitation energies for the 5s2 1S0 – 5s5p 3P1, 1P1 transitions in Sr I and Y II spectra

1987 ◽  
Vol 65 (12) ◽  
pp. 1612-1619 ◽  
Author(s):  
J. Migdalek ◽  
W. E. Baylis
Keyword(s):  
Electron Correlation ◽  
Oscillator Strengths ◽  
Excitation Energies ◽  
Core Electron ◽  
Polarization Model ◽  
Core Polarization ◽  
The Core ◽  
Relativistic Configuration ◽  
Comparison Of The Results ◽  
Good Agreement

Energies and oscillator strengths for the spin-allowed 5s2 1S0 – 5s5p 1P1 and spin-forbidden 5s2 1S0 – 5s5p 3P1 transitions in neutral strontium and singly ionized yttrium are determined in relativistic multiconfiguration Dirac–Fock computations where modest relativistic configuration mixing to represent intravalence correlation is combined with a polarization model to account for valence–core electron correlation. It is demonstrated, by comparison of the results corrected for electron correlation with those obtained from relativistic intermediate coupling Dirac–Fock calculations, that both intravalence and core–valence correlation are important for achieving good agreement with experiment. However, for neutral strontium it is the intravalence correlation that seems to be more important whereas for the isoelectronic singly ionized yttrium the core-valence correlation, as represented by the core-polarization model, dominates. A delicate balance resulting from the partial collapse of the 4d orbital in Y+ may be a reason for the greater sensitivity to core polarization in this system.

Core-polarization effects in subordinate series of the alkali atoms

1989 ◽  
Vol 67 (10) ◽  
pp. 996-1001 ◽  
Author(s):  
Carmen Barrientos ◽  
Inmaculada Martin
Keyword(s):  
Dipole Moment ◽  
Experimental Results ◽  
Quantum Defect ◽  
Oscillator Strengths ◽  
Transition Operator ◽  
Orbital Method ◽  
Effective Dipole Moment ◽  
Core Polarization ◽  
Polarization Effects ◽  
Alkali Atoms

The quantum defect orbital method, including core-polarization effects through an effective dipole-moment transition operator, has been followed to calculate oscillator strengths involving the sharp and diffuse series in the alkali atoms. Comparisons are made among various theoretical and experimental results and those predicted here. It is shown that the formalism adequately describes transitions in subordinate series of the alkali atoms.

Sign in / Sign up

Export Citation Format

Share Document