Influence of hot and dense plasmas on energy levels and oscillator strengths of ions: beryllium-like ions for<i>Z</i>= 26–36

Li, Yongqiang; Wu, Jianhua; Hou, Yuxin; Yuan, Jing

doi:10.1088/0953-4075/41/14/145002

Cited by 47 publications

(27 citation statements)

References 35 publications

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“…In addition, the effect of quantum confinement is the same for the fine structure states. The figure further confirms that the quantum confinement is more pronounced for higher excited states than relatively low-lying states [28]. The relative variations of oscillator strengths with respect to µ values for the most strong 2s 2 S 1/2 → 2p 2 P 1/2,3/2 transitions of C 3+ , N 4+ , and O 5+ ions are shown in Fig.…”

Section: Resultssupporting

confidence: 73%

“…This figure further reflects that the shift in the EEs decreases as the nuclear charge increases. These shifts in the EEs can be attributed by the quantum confinement and electron screening in the presence of the plasma environment [28]. It is well known that the quantum defect decreases as the orbital angular momentum quantum number increases, and for angular momentum quantum number equal and larger than two, the quantum defect is almost zero.…”

Section: Resultsmentioning

confidence: 98%

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Effect of screening on spectroscopic properties of Li-like ions in a plasma environment

et al. 2013

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This work presents accurate ab initio investigations of various spectroscopic properties of a fewLi-like ions in presence of a plasma environment within the Debye screening potential. The coupledcluster theory in the relativistic framework has been employed to compute ionization potentials, excitation energies, electric dipole oscillator strengths, and electric quadrupole transition probabilities of Li-like C 3+ , N 4+ , and O 5+ ions. The unretarded Breit interaction has been implemented to increase the accuracy of the calculations. The effects of ion density and temperature on the ionization potentials, excitation energies, electric dipole oscillator strengths, and electric quadrupole transition probabilities have been investigated in the plasma environment. It is found that the plasma screening leads to a sharp decrease in the ionization potential as the screening strength increases. With increasing strength, the oscillator strengths associated with 2s 2 S 1/2 →2p 2 P 1/2,3/2 transitions increase, whereas the transition probabilities associated with 3d 2 D 3/2,5/2 →2s 2 S 1/2 transitions decrease.With the advent of novel x-ray sources based on free-electron lasers (FELs) [1, 2], laser plasmas [3], and high-harmonic generations [4,5], it is possible to achieve extreme conditions in matter such as high energy density and high temperature using ultraintense, ultrashort, and tunable pulses, and hence it is possible to create matter in plasma form [6,7]. There have been many experimental [6][7][8][9][10][11][12][13][14][15][16] and theoretical [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] endeavors to explain and understand the effect of plasma environment on the spectroscopic properties of atoms and ions. In the situation, when atoms or ions embedded in plasma, the interaction between the nucleus and the bound electrons is screened by the surrounding ions and fast electrons. The modified interaction gives rise to phenomena such as pressure ionization and continuum lowering and affects the spectroscopic properties of atoms and ions [36,37]. Recent advanced experiment, carried out using FEL and electron beam ion trap (EBIT), provides an unexpected low oscillator strength of electric dipole (E1) transition of Fe 16+ and raises the concern about the quality of the atomic wave functions used to model such spectral properties [38]. Therefore, treating the effect of plasma environment in atoms and ions along with an accurate treatment of electron-electron correlation and relativistic effects are nontrivial. The ratio of Coulomb energy to thermal energy determine the strength of coupling (Γ) in plasma. The low density and high temperature situation corresponds to weakly coupled plasma (Γ < 1), where the screening of the nuclear Coulomb interaction by free electrons in the plasma is guided by the Debye model [39,40].Lithium and lithium-like ions in plasma are a few of the most abundant ionic species for specific temperature and density attainable in the laboratory [41]. Various spectroscopic ...

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 98%

Effect of screening on spectroscopic properties of Li-like ions in a plasma environment

et al. 2013

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“…It is well known that the shift in the energy level of atoms and ions in plasma arises due to the electron screening and quantum confinement [6] for bound-state orbitals. The inner levels which are close to the nucleus experience comparably higher screening effects than those lying near the boundary region (see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Significant theoretical and experimental progress has been made over the last few years in explaining and predicting the spectral lines of atoms and ions embedded in plasma environment [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Despite considerable progress, interest in theoretical investigation of plasma screening effects on the electronic structures of ions has remained unabated over the years.…”

Section: Introductionmentioning

confidence: 99%

“…Saha and Fritzsche [15] studied the changes of energy levels, oscillator strengths, and emission rates for a Be I isoelectronic sequence using the multiconfiguration Dirac-Fock (MCDF) method. Recently, Li et al [24] investigated the influence of hot and dense plasmas by invoking the average-atom model on energy levels and oscillator strengths of beryllium-like ions for Z = 26-36, over a wide range of temperatures and densities using the self-consistent-field multiconfiguration Dirac-Fock method. It is pertinent to note that transition energies and related properties reported in most of these investigations were carried out in a nonrelativistic framework with some exceptions [25].…”

Section: Introductionmentioning

confidence: 99%

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Application of relativistic Fock-space coupled-cluster theory to study Li and Li-like ions in plasma

Das

Chaudhuri

et al. 2012

Phys. Rev. A

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The ionization potentials, transition energies, and oscillator strengths of Li and Li-like C 3+ and Al 10+ are computed at different plasma environments with the Fock-space multireference coupled-cluster theory to examine the parametric dependence of these properties on plasma density and/or temperature. The results presented here show that the ionization and transition energies as well as the oscillator strengths are very sensitive to the plasma environment. It further shows that the spectral lines corresponding to n = 0 transitions for Li-like C 3+ and Al 10+ are blueshifted, whereas the lines associated to n = 0 are redshifted (n is the principal quantum number).

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Generalized energy approach for calculating electron collision cross‐sections for multicharged ions in a plasma: Debye shielding model

Malinovskaya

Глушков

Khetselius

et al. 2010

Int J of Quantum Chemistry

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A uniform quantum energy approach for studying spectra of the multicharged ions in a plasmas and the electron-ion collision cross sections is presented. The approach is based on formally exact QED theory by using the relativistic Dirac Hamiltonian for electron-nuclear and electron-electron potentials, the gauge invariant scheme of generation for the optimal one-quasiparticle representation and the Debye shielding model. The measured and calculated electron-collisional excitation cross sections for Ne-like barium ion for different values of the incident electron energy are presented and analyzed.

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Influence of hot and dense plasmas on energy levels and oscillator strengths of ions: beryllium-like ions forZ= 26–36

Cited by 47 publications

References 35 publications

Effect of screening on spectroscopic properties of Li-like ions in a plasma environment

Effect of screening on spectroscopic properties of Li-like ions in a plasma environment

Application of relativistic Fock-space coupled-cluster theory to study Li and Li-like ions in plasma

Generalized energy approach for calculating electron collision cross‐sections for multicharged ions in a plasma: Debye shielding model

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