Relativistic distorted-wave excitation cross sections of F-like selenium by electron collision

RDWB procedures were applied to study the excitation cross sections induced by electron collision for F-like selenium. GRASP(2) code was used for atom ic structure calculations. By approaching from the 'post' form approximatio n, it was possible to overcome the complexity involved in using non-orthogo nal orbits. From the multipole expansion of the inter-electron potential us ed, it was found justifiable to add a correction term to the exchange Slate r integrals due to the non-orthogonal orbitals. Comparisons are made of the resulting cross sections for excitation from the three low-lying levels as calculated using 113-level and 279-level MCDF configuration expansion both between themselves as well as with existing data. More than 10% in differe nce has been found in these comparisons.