Dynamic polarizability and electric multipolar transitions in two electron atoms under exponential cosine screened coulomb potential

2016 ◽  
Vol 23 (5) ◽  
pp. 053305 ◽  
Author(s):  
Supriya K. Chaudhuri ◽  
Lucas Modesto-Costa ◽  
Prasanta K. Mukherjee
Keyword(s):  
Coulomb Potential ◽  
Dynamic Polarizability ◽  
Screened Coulomb Potential

scholarly journals Application of the screened Coulomb potential to fit the DA-type variable star HS 0507 + 0434B

2020 ◽  
Vol 495 (2) ◽  
pp. 2428-2435 ◽  
Author(s):  
Y H Chen
Keyword(s):  
Coulomb Potential ◽  
The Core ◽  
Star Models ◽  
Pure Coulomb ◽  
Type Variable ◽  
Diffusion Scheme ◽  
Best Fitting ◽  
Composition Profiles ◽  
Screened Coulomb Potential ◽  
Coulomb Potentials

ABSTRACT wdec is used to evolve grids of DA-variable (DAV) star models adopting the element diffusion scheme with pure and screened Coulomb potentials. The core compositions are thermonuclear burning results derived from mesa. mesa yields composition profiles that the version of wdec used in this work could not accommodate (most notably, the presence of helium in the core of the model). According to the theory of rotational splitting, Fu and colleagues identified six triplets for the DAV star HS 0507 + 0434B based on 206 h of photometric data. The grids of DAV star models are used to fit the six reliable m = 0 modes. When adopting the screened Coulomb potential, a best-fitting model of log(MHe/M*) = −3.0, log(MH/M*) = −6.1, Teff = 11 790 K, M* = 0.625 M⊙, log g = 8.066 and σRMS = 2.08 s was obtained. Compared with adopting the pure Coulomb potential, the value of σRMS is improved by 34 per cent. This study may provide a new method for research into mode-trapping properties.

Accurate computation of screened Coulomb potential integrals in numerical Hartree–Fock programs

2019 ◽  
Vol 244 ◽  
pp. 217-227 ◽  
Author(s):  
Li Guang Jiao ◽  
Li Rong Zan ◽  
Lin Zhu ◽  
Jia Ma ◽  
Yew Kam Ho
Keyword(s):  
Coulomb Potential ◽  
Hartree Fock ◽  
Accurate Computation ◽  
Screened Coulomb Potential

Group Theoretic Approach to the Exponential Cosine Screened Coulomb Potential

1985 ◽  
Vol 40 (5) ◽  
pp. 453-455 ◽  
Author(s):  
Barnana Roy
Keyword(s):  
Perturbation Method ◽  
Coulomb Potential ◽  
Analytical Formula ◽  
Theoretic Approach ◽  
Energy Eigenvalues ◽  
Screened Coulomb Potential ◽  
Simple Analytical Formula

Perturbation method, using the properties of SO (2,1) algebra is applied to get a simple analytical formula for energy eigenvalues of the exponential cosine screened Coulomb potential.

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