scholarly journals Ab initio calculations of Ca iii Stark broadening parameters, transition probabilities and radiative lifetimes

2013 ◽  
Vol 431 (3) ◽  
pp. 2703-2715 ◽  
Author(s):  
A. Alonso-Medina ◽  
C. Colón
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Transition Probabilities ◽  
Stark Broadening ◽  
Radiative Lifetimes

Ab initio calculations of radiative transition probabilities in SH, SH+, and SH−

1985 ◽  
Vol 83 (9) ◽  
pp. 4661-4667 ◽  
Author(s):  
Jörg Senekowitsch ◽  
Hans‐Joachim Werner ◽  
Pavel Rosmus ◽  
Ernst‐Albrecht Reinsch ◽  
S. V. ONeil
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Transition Probabilities ◽  
Radiative Transition

scholarly journals Theoretical transition probabilities, radiative lifetimes and Stark broadening parameters of singly ionized magnesium

2019 ◽  
Vol 490 (2) ◽  
pp. 1734-1737
Author(s):  
C Moreno-Díaz ◽  
A Alonso-Medina
Keyword(s):  
Transition Probabilities ◽  
Principal Quantum Number ◽  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Atomic Data ◽  
Stark Broadening ◽  
Asymptotic Dependence ◽  
Radiative Lifetimes ◽  
Ionized Magnesium ◽  
Effective Principal

ABSTRACT The presence of spectral lines of singly ionized magnesium (Mg ii) in stellar atmospheres has been reported in different stars. Recently, the low-resolution spectrum obtained from Supernova 2014 J in M82, in which Mg ii absorption lines centred on 4400 Å as well as 7600 Å stand out, has been analysed. This is the motive for the atomic data calculations in this work, which are of much interest in the astrophysical area. In this article, ab initio relativistic Hartree–Fock calculations in an intermediate coupling formalism using Cowan’s code allowed us to obtain the required transition probabilities to calculate the theoretical radiative lifetimes for excited nS−, nP−, nD− and nF− states of singly ionized magnesium. An asymptotic dependence of lifetime (τnl) on the effective principal quantum number (n*) has been determined. Also, the Griem semi-empirical approach was used to obtain the theoretical Stark parameters (width and shift) of spectral lines; these data are displayed for an electron density of 1017 cm−3 and temperatures T = 10–100 (×103 K). We have compared the results of lifetimes for 16 levels and Stark parameters for seven spectral lines with previously reported experiments available in the literature. Finally, we discuss the behaviour of the Stark parameters versus temperature for three relevant spectral lines (2802.70, 2797.99 and 7868.04 Å).

Ab initio calculations for dipole-forbidden transitions in NBr: Radiative lifetimes of the b 1Σ+ and a 1Δ states

1989 ◽  
Vol 133 (3) ◽  
pp. 345-354 ◽  
Author(s):  
K. Bhanuprakash ◽  
Praphull Chandra ◽  
Gerhard Hirsch ◽  
Robert J. Buenker
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Radiative Lifetimes ◽  
Forbidden Transitions

scholarly journals Metastable level properties of the excited configuration 4p64d84f

2015 ◽  
Vol 55 (2) ◽  
Author(s):  
Rasa Karpuškienė ◽  
Pavel Bogdanovich ◽  
Romualdas Kisielius
Keyword(s):  
Ab Initio ◽  
Configuration Interaction ◽  
Transition Probabilities ◽  
Excited Configuration ◽  
Metastable Level ◽  
Radiative Lifetimes ◽  
Hartree Fock ◽  
Radiative Transitions

Metastable levels in rhodium-like ions with the ground configuration 4p64d9 and the excited configurations 4p64d84f and 4p54d10 are investigated. The ab initio calculations of the level energies, radiative multipole transition probabilities are performed in a quasirelativistic Hartree–Fock approximation employing an extensive configuration interaction based on quasirelativistic transformed radial orbitals. Systematic trends in the behavior of calculated radiative lifetimes of the metastable levels are studied for the ions from Z = 60 to Z = 92. The significance of the radiative transitions of higher multipole order (M2 and E3) for the calculated radiative lifetimes is demonstrated and discussed.

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