One-electron spectrum of Xe viii

Abstract
The spectrum of Xe VIII has been observed in a theta-pinch discharge. New line identifications were made that determine the energies of the 6s, 7s, 6p, and 5f terms relative to the 5s2S ground state and confirm the previously known 5p and 5d terms. An independent system of levels derived from the observed 4f-ng (n = 5,6) transitions was found. Its position relative to the ground state is obtained from a predicted value for the 5g effective quantum number n*. From the ns series (n = 5–7) a value for the ionization enegy of 105.91 ± 0.05 eV was derived.