scholarly journals Fine Structure Calculations of the Energy Levels, Oscillator Strength and Transition Probabilities For as Like Gallium

2016 ◽  
Vol 1 (1) ◽  
pp. 1-7
Author(s):  
A.I. Refaie ◽  
M.S.M. Nour El-Din ◽  
L.M. Ahamed ◽  
S.H. Allam
Keyword(s):  
Fine Structure ◽  
Oscillator Strength ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Structure Calculations

Multiconfigurational Dirac–Fock atomic structure calculations for Cl-like tungsten

2014 ◽  
Vol 92 (3) ◽  
pp. 177-183 ◽  
Author(s):  
Man Mohan ◽  
Sunny Aggarwal ◽  
Narendra Singh
Keyword(s):  
Quantum Electrodynamics ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Theoretical Data ◽  
Oscillator Strengths ◽  
Atomic Data ◽  
Plasma Diagnostic ◽  
Fusion Plasma ◽  
Atomic Structure Calculations ◽  
Structure Calculations

Energy levels, lifetimes, and wavefunction compositions have been calculated for all levels of odd parity 3s23p5 ground configuration as well as 3s3p6 and 3s23p43d even parity excited configurations in highly charged Cl-like tungsten ion. Transition probabilities, oscillator strengths, and line strengths for E1, E2, M1, and M2 transitions have been obtained using the fully relativistic multiconfiguration Dirac–Fock (MCDF) approach including the correlations within the n = 3 complex, some n = 3 → n = 4 single and double excitations and Breit and quantum electrodynamics effects. For comparison from our calculated energy levels, we have also calculated the energy levels by using the fully relativistic flexible atomic code (FAC). The validity of the method is assessed by comparison with previously published experimental and theoretical data. The excellent agreement observed between our calculated results and those obtained using different approaches confirm the accuracy of our results. Additionally, we have predicted some new atomic data for W57+ that are not available so far and may be important for plasma diagnostic analysis in fusion plasma.

Atomic structure calculations for Br-like ions

2015 ◽  
Vol 93 (5) ◽  
pp. 487-495 ◽  
Author(s):  
Arun Goyal ◽  
Indu Khatri ◽  
Sunny Aggarwal ◽  
A.K. Singh ◽  
Man Mohan
Keyword(s):  
Transition Probabilities ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Atomic Data ◽  
Plasma Diagnostic ◽  
Fusion Plasma ◽  
Atomic Structure Calculations ◽  
Structure Calculations ◽  
Good Agreement

Energy levels, wavefunction compositions, and lifetimes are computed for all levels of 4s24p5, 4s24p44d, and 4s4p6 configurations in Br-like ions (Z = 47–50). We use the multiconfigurational Dirac–Fock method to generate the wavefunctions. We also present the transition wavelengths, oscillator strengths, transition probabilities, and line strengths for the electric dipole (E1) transition from the ground state configuration. We compare our calculated results with the available data in the literature and good agreement is obtained, which confirms the quality of our results. Moreover, we predict some new atomic data that have not been available so far and may be important for plasma diagnostic analysis in fusion plasma.

Energy levels and radiative transitions of the K-shell excited sextet states in boron-like sulfur ion

2016 ◽  
Vol 94 (10) ◽  
pp. 1054-1060 ◽  
Author(s):  
Yan Sun ◽  
CuiCui Sang ◽  
KaiKai Li ◽  
XinYu Qian ◽  
Feng Hu ◽  
...  
Keyword(s):  
Fine Structure ◽  
Relativistic Effect ◽  
Transition Probabilities ◽  
Theoretical Calculations ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Variation Method ◽  
First Order ◽  
Radiative Transitions ◽  
First Order Perturbation

Theoretical calculations are reported for energy levels and transition probabilities of the K-shell excited sextet series 6Se,o(m) and 6Po,e(m) (m = 1–7) for the astrophysically important element sulfur. Energy levels, fine structure splittings, and transition parameters of the high-lying sextet series 6Se,o(m) and 6Po,e(m) (m = 1–7) in boron-like sulfur ion are calculated with the multi-configuration Rayleigh–Ritz variation method. To obtain the accurate energy level, the relativistic corrections and mass polarization effect are included by using the first-order perturbation theory. Configuration structures of these sextet series are assigned according to the energies, percentage contributions of basis states to the eigenvector, relativistic effect corrections, and verification of fine structure splittings. The oscillator strengths, transition probabilities, and wavelengths of electric-dipole transitions between 6So,e(m) and 6Pe,o(m) (m = 1–7) states are also systematically calculated and discussed.

The fine structure of the line 4686 Å of singly ionized helium

1954 ◽  
Vol 226 (1166) ◽  
pp. 377-392 ◽  
Keyword(s):  
Fine Structure ◽  
Quantum Electrodynamics ◽  
Stark Effect ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Resolving Power ◽  
Doppler Width ◽  
Dirac Theory ◽  
Fabry Perot ◽  
In Series

A liquid-hydrogen-cooled discharge tube similar to that formerly used in the investigation of the fine structure of the a-line of heavy hydrogen has now been used to reduce the Doppler width of the components of the line n = 4 -> n = 3 in the spectrum of He + . The resolving power necessary to separate some components was obtained without sacrificing spectral range by using two Fabry-Perot etalons in series mounted externally to a prism spectrograph. For other components a single etalon was used. Eight components were resolved and their separations measured, and a ninth partially resolved. The positions of certain band lines of hydrogen and helium which lie close to the He + complex and overlap it in different orders of interference were also measured. The relative intensities of the components were broadly in agreement with the relative transition probabilities calculated from the Dirac theory, but some anomalies were observed. From the measurements it is deduced that some of the energy levels are displaced from the positions predicted by the Dirac theory: the 3 S 1/2 level upwards by 0.140±0.005 cm -1 , the 4 S 1/2 level upwards by 0.056 + 0.003 cm -1 and the 4 P 1/2 level downwards by 0.011 ±0.003 cm -1 . These displacements of the S 1/2 levels are in good agreement with the predictions of the new theory of quantum electrodynamics, but the theory does not predict a displacement of the 4 P 1/2 level by this amount. The Stark effect could account for part of the discrepancy, but there remains a disagreement with the theory which exceeds the estimated experimental error.

Theoretical Calculations of Energy Levels, Oscillator Strength, and Transition Probabilities of Ne-Like Cr XV

2016 ◽  
Vol 5 (2) ◽  
pp. 274-282
Author(s):  
W. S. Abdelaziz ◽  
M. E. Ahmed ◽  
S. Sayed ◽  
L. Gaabour ◽  
A. Abou El-Magid ◽  
...  
Keyword(s):  
Oscillator Strength ◽  
Transition Probabilities ◽  
Theoretical Calculations ◽  
Energy Levels

Multiconfigurational Dirac–Fock energy levels and radiative rates for Ni XXI

2014 ◽  
Vol 92 (11) ◽  
pp. 1285-1296 ◽  
Author(s):  
Sunny Aggarwal ◽  
Nupur Verma ◽  
A.K. Singh ◽  
Narendra Singh ◽  
Rinku Sharma ◽  
...  
Keyword(s):  
Transition Probabilities ◽  
Transition Probability ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Fusion Plasmas ◽  
Transition Wavelength ◽  
Forbidden Transitions ◽  
New Energy ◽  
Atomic Structure Calculations ◽  
Structure Calculations

We present accurate atomic structure calculations for the lowest 200 fine structural energy levels for oxygen-like nickel, which may be a useful ion for both astrophysical and fusion plasmas. For the calculations of energy levels and radiative rates, we have used the multiconfigurational Dirac–Fock method. Our results are compared with those obtained using other numerical methods and experiments so that their accuracy can be assessed. The transition wavelengths, oscillator strengths, and radiative rates are reported for electric dipole (E1) transitions from the ground state. We have also presented the transition probabilities and transition wavelength of some forbidden transitions. Finally, we predict new energy levels, oscillator strengths, and transition probability data, where no other theoretical or experimental results are available, which may be useful for future experimental work.

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