scholarly journals Multiconfiguration Dirac–Hartree–Fock radiative parameters for emission lines in Ce ii–iv ions and cerium opacity calculations for kilonovae

2020 ◽  
Vol 501 (1) ◽  
pp. 1440-1452
Author(s):  
H Carvajal Gallego ◽  
P Palmeri ◽  
P Quinet
Keyword(s):  
Neutron Star ◽  
Large Scale ◽  
Radiative Properties ◽  
Emission Lines ◽  
Atomic Data ◽  
Theoretical Studies ◽  
Electronic Correlations ◽  
Hartree Fock ◽  
Atomic Structures ◽  
Experimental And Theoretical Studies

ABSTRACT Large-scale calculations of atomic structures and radiative properties have been carried out for singly, doubly, and trebly ionized cerium. For this purpose, the purely relativistic multiconfiguration Dirac–Hartree–Fock (MCDHF) method was used, taking into account the effects of valence–valence and core–valence electronic correlations in detail. The results obtained were then used to calculate the expansion opacities characterizing the kilonovae observed as a result of neutron star mergers. Comparisons with previously published experimental and theoretical studies have shown that the results presented in this work are the most complete currently available, in terms of quantity and quality, concerning the atomic data and monochromatic opacities for Ce ii, Ce iii, and Ce iv ions.

scholarly journals Benchmarking Atomic Data from Large-scale Multiconfiguration Dirac–Hartree–Fock Calculations for Astrophysics: S-like Ions from Cr ix to Cu xiv

2018 ◽  
Vol 239 (2) ◽  
pp. 30 ◽  
Author(s):  
K. Wang ◽  
C. X. Song ◽  
P. Jönsson ◽  
G. Del Zanna ◽  
S. Schiffmann ◽  
...  
Keyword(s):  
Large Scale ◽  
Atomic Data ◽  
Hartree Fock

A study for hydrogen-like lawrencium

2018 ◽  
Vol 96 (12) ◽  
pp. 1359-1364
Author(s):  
Güldem Ürer
Keyword(s):  
Quantum Electrodynamics ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Atomic Data ◽  
Hartree Fock ◽  
Atomic Structures ◽  
Transverse Photon ◽  
Qed Effects ◽  
Hydrogenic Ions

Studying hydrogenic ions with high Z is an occasion to understand atomic structure. It also provides a reliable test of methods used to determine atomic structures. Many fields and applications require precise atomic data. For this reason, a hydrogen-like study is performed for lawrencium (Lr102+, Z = 103). The energy levels of hydrogen-like lawrencium are calculated with both multiconfiguration Hartree–Fock (MCHF) and multiconfiguration Dirac–Fock (MCDF) methods. The calculations contain Breit–Pauli relativistic corrections in MCHF calculation and the transverse photon and quantum electrodynamics (QED) effects in MCDF calculation along with electron correlations. In addition, some transition parameters (wavelengths, λ, logarithmic weighted oscillator strengths, log(gf) value, and transition probabilities, Aki) for allowed (E1) and forbidden (E2 and M1) transitions are investigated. The results from this study are compared with only a few theoretical works, but there is no available experimental data yet for Lr102+.

Flame Blowoff Studies Using Large-Scale Flameholders

1982 ◽  
Vol 104 (4) ◽  
pp. 853-857 ◽  
Author(s):  
K. V. L. Rao ◽  
A. H. Lefebvre
Keyword(s):  
Experimental Data ◽  
Large Scale ◽  
Water Injection ◽  
Injection Technique ◽  
Theoretical Studies ◽  
Effective Pressure ◽  
Test Program ◽  
Combustible Mixtures ◽  
Experimental And Theoretical Studies ◽  
Good Agreement

Experimental and theoretical studies are made of the factors governing the blowoff velocities of stabilized flames supplied with flowing gaseous combustible mixtures. The test program includes wide variations in effective pressure, obtained using the water injection technique, and also covers wide ranges of velocity, flameholder size, and flameholder blockage. An equation is derived for predicting blowoff velocities which shows good agreement with the experimental data.

scholarly journals In vitro large-scale experimental and theoretical studies for the realization of bi-directional brain-prostheses

2013 ◽  
Vol 7 ◽  
Author(s):  
Paolo Bonifazi ◽  
Francesco Difato ◽  
Paolo Massobrio ◽  
Gian L. Breschi ◽  
Valentina Pasquale ◽  
...  
Keyword(s):  
Large Scale ◽  
Theoretical Studies ◽  
Experimental And Theoretical Studies
Sign in / Sign up

Export Citation Format

Share Document