Abstract

The XUV spectrum of niobium was obtained by using a low-inductance vaccum spark and a grazing-incidence, high-resolution spectrograph. Identifications of wavelengths and lines were made in the 20–60-Å region for complex arrays involving 3d–4p and 3d–4f transitions. Atomic structure calculations using relativistically corrected Hartree–Fock wave functions provided the theoretical basis for line classifications. The 3d9–3d84p,4f and 3p53d10–3p53d94p,4f transitions in Nb xv and satellites to the Ni-like 3d10–3d94p,4f lines were classified. Energy levels for the 3d84p and 3d84f configurations in Nb xv were determined by using Slater integrals scaled by least-squares fitting.

© 1982 Optical Society of America

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