Spectral analysis of the 4d96s configuration in eight times ionized xenon, Xe IX

A capillary light source was used to observe the spectrum of eight times ionized xenon, Xe IX, in the vacuum ultraviolet range, 270-2000 Å. Sixteen transitions have been identified as combinations between energy levels of the 4d96s with 4d95p configuration, and all 4d96s levels have been determined. The present analysis is based on an accurate extrapolation of energy parameters and experimental energy level values in the Pd I isoelectronic sequence. The energy parameters were obtained with Hartree-Fock relativistic calculations. Least-squares parametric calculation has been carried out to study the fit between experimental and theoretical values.