Effects of plasma screening on radiative transition and photoionization of Si10+–Si13+ in a dense plasma environment

2021 ◽  
pp. 107777
Author(s):  
Jiaolong Zeng ◽  
Yongjun Li ◽  
Jianmin Yuan
Keyword(s):  
Dense Plasma ◽  
Radiative Transition ◽  
Plasma Environment ◽  
Plasma Screening

scholarly journals On the Appearance of a Cooper Minimum in the Photoionization Cross Sections of the Plasma-Embedded Li Atom

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Satyabrata Sahoo ◽  
Y. K. Ho
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Debye Screening Length ◽  
Debye Screening ◽  
Screening Length ◽  
Screening Effect ◽  
Plasma Environment ◽  
Plasma Screening ◽  
Debye Plasma

The plasma screening effect is found to uncover a Cooper minimum in the photoionization cross sections from the ground state of the Li atom embedded in Debye plasma environment. The variation of the location of this minimum with Debye screening length is discussed and analyzed in terms of the instability of the ground state.

scholarly journals Effect of Dense Plasma Environment on the Spectroscopic Properties of He-like Ca18+ Ion

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Dishu Dawra ◽  
Mayank Dimri ◽  
A. K. Singh ◽  
Alok K. S. Jha ◽  
Shougaijm Somorendro Singh
Keyword(s):  
Dense Plasma ◽  
Spectroscopic Properties ◽  
Plasma Environment

scholarly journals Ionization potential depression and ionization balance in dense carbon plasma under solar and stellar interior conditions

2020 ◽  
Vol 644 ◽  
pp. A92
Author(s):  
Jiaolong Zeng ◽  
Yongjun Li ◽  
Yong Hou ◽  
Cheng Gao ◽  
Jianmin Yuan
Keyword(s):  
Ionization Potential ◽  
Dense Plasma ◽  
Solar Interior ◽  
Hydrogen Atoms ◽  
Free Electrons ◽  
Ionization Degree ◽  
Stellar Interior ◽  
Plasma Screening ◽  
Ionization Balance ◽  
Carbon Plasma

Recent quantitative experiments on the ionization potential depression (IPD) in dense plasma show that the observational results are difficult to explain with the widely used analytical models for plasma screening. Here, we investigate the effect of plasma screening on the IPD and ionization balance of dense carbon plasma under solar and stellar interior conditions using our developed consistent nonanalytical model. The screening potential can be primarily attributed to the free electrons in the plasma and is determined by the microspace distribution of these free electrons. The ionization balance is determined by solving the Saha equation, including the effect of IPD. The predicted IPD and average ionization degree are larger than those obtained using the Stewart–Pyatt model for mass densities that are greater than 3.0 g cm−3. Under solar interior conditions, our results are in better agreement with the Ecker–Kröll model at electron temperatures and densities lower than 250 eV and 2.1 × 1023 cm−3 and in the best agreement with the ion-sphere model at 303 eV and 4.3 × 1023 cm−3. Finally, our results are compared with those obtained via a recent experiment on a CH-mixture plasma that has been compressed six times. The predicted average ionization degree of C in a CH mixture agrees better with the experiment than the Stewart–Pyatt and Thomas–Fermi models when the screening from free electrons contributed by hydrogen atoms is included. Our results provide useful information concerning the ionization balance and can be applied to investigate the opacity and equations of state for dense plasma under the solar and stellar interior conditions.

scholarly journals Plasma environment effects on K lines of astrophysical interest

2019 ◽  
Vol 624 ◽  
pp. A74 ◽  
Author(s):  
J. Deprince ◽  
M. A. Bautista ◽  
S. Fritzsche ◽  
J. A. García ◽  
T. R. Kallman ◽  
...  
Keyword(s):  
Black Hole ◽  
Electron Temperature ◽  
Accretion Disks ◽  
Atomic Structure ◽  
Radiative Transition ◽  
Ionization Potentials ◽  
Plasma Environment ◽  
Black Hole Accretion ◽  
Environment Effects ◽  
Hole Accretion

Aims. In the context of black-hole accretion disks, the main goal of the present study is to estimate the plasma environment effects on the atomic structure and radiative parameters associated with the K-vacancy states in ions of the oxygen isonuclear sequence. Methods. We used a time-averaged Debye–Hückel potential for both the electron–nucleus and the electron–electron interactions implemented in the fully relativistic multiconfiguration Dirac–Fock (MCDF) method. Results. Modified ionization potentials, K thresholds, Auger widths, and radiative transition wavelengths and rates are reported for O I–O VII in plasma environments with electron temperature and density ranges 105−107 K and 1018−1022 cm−3.

scholarly journals Influence of plasma environment on K-line emission in highly ionized iron atoms evaluated using a Debye–Hückel model

2017 ◽  
Vol 95 (9) ◽  
pp. 858-861 ◽  
Author(s):  
J. Deprince ◽  
S. Fritzsche ◽  
T.R. Kallman ◽  
P. Palmeri ◽  
P. Quinet
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Line Emission ◽  
Ionization Potentials ◽  
Iron Ions ◽  
Transition Energies ◽  
Plasma Environment ◽  
Plasma Screening ◽  
Atomic Parameters ◽  
Electron Interactions

The influence of plasma environment on the atomic parameters associated with the K-vacancy states has been investigated theoretically for several iron ions. To do this, a time-averaged Debye–Hückel potential for both the electron–nucleus and electron–electron interactions has been considered in the framework of relativistic multiconfiguration Dirac–Fock computations. More particularly, the plasma screening effects on ionization potentials, K-thresholds, transition energies, and radiative rates have been estimated in the astrophysical context of accretion disks around black holes. In the present paper, we describe the behaviour of those atomic parameters for Ne-, Na-, Ar-, and K-like iron ions.

Dense-plasma screening effects on the thermonuclear 3H(2H,n)4He fusion reaction

2019 ◽  
Vol 28 (01n02) ◽  
pp. 1950004 ◽  
Author(s):  
M. Moeini Arani
Keyword(s):  
Effective Field Theory ◽  
Reaction Rate ◽  
Liquid Drop ◽  
Dense Plasma ◽  
Quantum Effect ◽  
Fusion Reaction ◽  
Effective Field ◽  
Electron Cloud ◽  
Theory Approach ◽  
Plasma Screening

We investigate the dense-plasma screening effects on the thermonuclear [Formula: see text] fusion reaction. In this study, we focus on the strong screening with the weak quantum effect in the thermonuclear region. At the first step, we calculate the cross-section and [Formula: see text]-factor of the bare [Formula: see text] fusion using a model inspired by halo/cluster effective field theory approach. The evaluations of the plasma screening corrections in the [Formula: see text]-factor and the reaction rate would be studied in the next step. Concentrating on the thermonuclear region, we use the Salpeter’s potential justifying the electron cloud around reactant as an incompressible and uniformly charged liquid drop. Finally, we show the changes in the [Formula: see text]-factor and production rate due to the screening electrons.

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