3d-Shell excitation in photoabsorption of atomic selenium

Abstract

The photoabsorption spectrum of the inner 3d-shell excitation of atomic selenium was observed in the 500–170 Å region using the flash-pyrolysis technique. The observations, aided by the Hartree–Fock ab initio calculations and least squares fitted parametric calculations, have lead to the classification of 15 lines in the 4p4–3d94s24p5 transition array and 26 lines in the 4p4–3d94s24p4np transitions. Two series ionization limits have been calculated as 517 500 cm−1 (64.15 eV) and 530 000 cm−1 (67.70 eV).