Precision measurement of relative oscillator strengths - IX. Measures of Fe I transitions from levels Formula

Oscillator strengths for transitions of astrophysical importance in SIII

Relativistic Quantum Defect Orbital (RQDO) calculations, with and without explict account for core-valence correlation, have been performed on dipole-allowed transitions between the levels belonging to the 3s2 3p2, 3s2 3p nd (n = 3, 4, 5), 3s2 3p ns (n = 4, 5) and 3s2 3p 4p configurations of the Si-like ion SIII in the LS-coupling scheme. The present oscillator strengths, which are of considera...

The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II

We report on experimental branching fractions (BFs) for 19 transitions from the three 3d5(6S)4s4p(3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 Å. Absolute oscillator strengths ( f -values) have been derived by combining the BFs with experimental radiative l...

Photoionization cross sections and oscillator strengths for Fe

Ab initio calculations are carried out for the photoionization cross sections and oscillator strengths for Fe III in the close-coupling approximation employing the R-matrix method. A 49-state eigenfunction expansion for Fe IV, with states dominated by the ground configuration 3d and the excited configurations 3d 4s and 3d 4p , is employed to ensure an extensive treatment of autoionizing resonan...

Semiclassical calculation of oscillator-strengths

2014 Because they play a fundamental role in the calculation of bound electron stoppingpowers, photon mean free paths and electron impact-excitation cross-sections, there is a need for a convenient method to calculate oscillator strengths for highly charged ions. In this paper we describe a simple semiclassical approximation for electron matrix-elements and oscillator strengths. The method is t...

Oscillator Strengths of Astrophysical Interest