Oscillator strengths gf for 2s2-[2s1/22p3/2]1 transition in Be-like multicharged ions of of GaXXVIII and GeXXIX Fe are computed for different values of the electron density and temperature (ne=1022-1024cm-3, T=0.5-2 keV) of plasmas are presented and compared with available alternative spectroscopic data. The generalized relativistic energy approach and relativistic many-body perturbation theory with the Debye shielding model as zeroth approximation is used for studying spectral parameters of ions in plasmas. An electronic Hamiltonian for N-electron ion in a plasma is added by the Yukawa-type electron-electron and nuclear interaction potential.
It is presented an advanced approach to computing the spectroscopic factors of the diatomic molecules, which is based on the hybrid combined density functional theory (DFT) and the Green's-functions (GF) approach. The Fermiliquid quasiparticle version of the density functional theory is modified and used. The density of states, which describe the vibrational structure in photoelectron spectra, is defined with the use of combined DFT-GF approach and is well approximated by using only the first order coupling constants in the optimized one-quasiparticle approximation. Using the combined DFT-GF approach to computing the spectroscopic factors of diatomic molecules leads to significant simplification of the calculation procedure and increasing an accuracy of theoretical prediction.function of the reference molecule and ) (t a k is an electron destruction operator, both in the Heisenberg picture.
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