Autoionization resonances in the photoabsorption spectra of Fe{sup n+} iron ions

Journal Article · Tue Nov 15 04:00:00 EST 2016 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776116110121· OSTI ID:22617145

The photoabsorption cross sections of a neutral iron atom, as well as positive Fe{sup +} and Fe{sup 2+} ions, are calculated in the relativistic random-phase approximation with exchange in the energy range 20–160 eV. The wavefunctions of the ground and excited states are calculated in the single-configuration Hartree–Fock–Dirac approximation. The resultant photoabsorption spectra are compared with experimental data and with the results of calculations based on the nonrelativistic spin-polarized version of the random-phase approximation with exchange. Series of autoionization resonance peaks, as well as giant autoionization resonance lines corresponding to discrete transitions 3p → 3d, are clearly observed in the photoabsorption cross sections. The conformity of the positions of calculated peaks of giant autoionization resonances with experimental data is substantially improved by taking into account additionally the correlation electron–electron interaction based on the model of the dynamic polarization potential.

• OSTI ID: 22617145
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 5 Vol. 123; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AUTOIONIZATION
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CORRELATIONS
CROSS SECTIONS
DIRAC APPROXIMATION
ELECTRON-ELECTRON INTERACTIONS
ELECTRONS
EXCITED STATES
HARTREE-FOCK METHOD
IRON IONS
MULTICHARGED IONS
POLARIZATION
RANDOM PHASE APPROXIMATION
RANDOMNESS
RELATIVISTIC RANGE
RESONANCE
SPIN
SPIN ORIENTATION
WAVE FUNCTIONS