Calculation Of Atomic Parameters Research Articles

High accuracy theoretical calculation of wavelengths and transition probabilities in Se- through Ga-like ions of tungsten

The Ab initio multiconfiguration Dirac-Hartree-Fock (MCDHF) calculations of atomic parameters have been carried out with high accuracy for four highly charged tungsten ions from Se-like W40+ to Ga-like W43+. The second-order relativistic many-body perturbation theory (MBPT) was used to confirm the accuracy of the MCDHF calculations. Excitation energies, wavelengths and transition rates of E1, M1, E2, M2, E3 and lifetimes are presented. The core-valence electron correlation effects arising from deep subshells 3d and 3p, have been taken into account along with relativistic effects. The calculated wavelengths are in good agreement with available experimental results.

Atomic data for PN analysis

This paper will review a selection of the work that has been published on the calculation of atomic parameters, relevant to PN, in the period since the 1992 Symposium. It will also attempt to address the accuracy of theoretical results, where possible. The review will concentrate primarily on results obtained using the powerful electron-scattering codes that describe resonance phenomena with ever increasing precision. Calculations of oscillator strengths and photoionisation cross-sections will not be discussed.

Dielectronic satellite spectra of hydrogenlike chromium.

Calculations of atomic parameters for dielectronic satellite lines of hydrogenlike chromium have been performed in the intermediate-coupling scheme with the inclusion of effects of configuration interaction. The doubly excited intermediate resonance states considered are chemically bond2l nl' SLJ>, n = 2, 3, and 4 with all allowed values of l and l'. The Hartree-Fock-Slater atomic model is used to calculate transition rates. X-ray and Auger transition energies are corrected for relativistic effects. Radiative and radiationless transition rates, fluorescence yields, nonradiative branching ratio, and lifetime of these doubly excited states are reported. For the wavelengths of a few strong satellite lines, effects of self-energy and vacuum polarization are included in our calculation. Dielectronic recombination rate coefficients are presented as a function of electron temperature.