5 research outputs found
Electron impact excitation of Gd XXXVII and radiative rates for Ni-like ions with 60 [MATH]
Energy levels and radiative rates for transitions among the 107 fine-structure levels belonging to the (1s22s22p6) 3s23p63d10, 3s23p63d94l, 3s23p53d104l, and 3s3p63d104l configurations of Ni-like ions with [MATH] have been calculated using the GRASP code. The collision strengths ([MATH]) have also been computed for transitions in Gd XXXVII at energies below 800 Ryd, using the DARC code. Resonances have been resolved in a fine energy mesh in the threshold region, and excitation rate coefficients have been calculated for transitions from the ground level to excited levels at temperatures below 2500 eV. These have been compared with those available in the literature, and enhancement in the values of rates, due to resonances, has been observed up to an order of magnitude for some of the transitions
Fine-structure splitting calculation in the Ar III ion: comparison of perturbative (Breit-Pauli) and non-perturbative (MCDF-EAL) predictions
PAMOP Project: computations in support of experiments and astrophysical applications
Our computation effort is primarily concentrated on support of current and
future measurements being carried out at various synchrotron radiation
facilities around the globe, and photodissociation computations for
astrophysical applications. In our work we solve the Schr\"odinger or Dirac
equation for the appropriate collision problem using the R-matrix or R-matrix
with pseudo-states approach from first principles. The time dependent
close-coupling (TDCC) method is also used in our work. A brief summary of the
methodology and ongoing developments implemented in the R-matrix suite of
Breit-Pauli and Dirac-Atomic R-matrix codes (DARC) is presented.Comment: 17 pages, 10 figures: chapter in the book, High Performance Computing
in Science and Engineering'16, edited by W. E. Nagel, D. B. Kr\"oner, and M.
Reich (Springer, New York and Berlin, 2017