Coherent correlation enhancement of outer shell photoionization cross sections of alkali-like ions

Calculation of the photoionization with de-excitation cross sections of He and helium-like ions

We discuss the results of the calculation of the photoionization with de-excitation of excited He and helium-like ions Li+ and B3+ at high but non-relativistic photon energies ω. Several lower 1S and 3S states are considered. We present and analyze the ratios R d of the cross sections of photoionization with de-excitation, σ (d)(ω), and of the photo-ionization with excitation, σ +∗(ω). The depe...

Absolute photoionization cross sections of atomic oxygen.

The abso lu t e va lues of t h e pho to ion iza t ion c r o s s s e c t i o n s of a tomic oxygen have been measured from t h e i o n i z a t i o n th reshold t o 120 1. An au to ion iz ing resonance belonging t o t h e 2 ~ 2 ~ ~ ( 4 ~ )3p( DO, 3s0, 3p0) t r a n s i t i o n h a s been observed a t 479.43 1 and another l i n e a t 389.97 1. The experimental d a t a is i n e x c e l l e n t agree...

The Calculation of Photoionization Cross Sections

Atomic Data for Astrophysics. II. New Analytic FITS for Photoionization Cross Sections of Atoms and Ions

We present a complete set of analytic fits to the non-relativistic photoionization cross sections for the ground states of atoms and ions of elements from H through Si, and S, Ar, Ca, and Fe. Near the ionization thresholds, the fits are based on the Opacity Project theoretical cross sections interpolated and smoothed over resonances. At higher energies, the fits reproduce calculated Hartree-Dir...

K-shell photoionization of Nickel ions using R-matrix

We present R-matrix calculations of photoabsorption and photoionization cross sections across the K edge of the Li-like to Ca-like ions stages of Ni. Levelresolved, Breit-Pauli calculations were performed for the Li-like to N a-like stages. Term-resolved calculations, which include the mass-velocity and Darwin relativistic corrections, were performed for the Mg-like to Ca-like ion stages. This ...