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Rh i isoelectronic sequence: analysis of the 4d9–4d85p transition array in La xiii

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Abstract

The spectrum of twelve-times ionized lanthanum (La xiii) was produced by a triggered, high-voltage, vacuum spark discharge and photographed by using the 10.7-m grazing-incidence spectrograph at the National Bureau of Standards. The wavelengths of spectral lines of the 4d9–4d85p array were measured in the 92–110-Å range. Twenty-eight observed lines in this array have been classified as transitions from twenty-five levels of the 4d85p configuration to the 4d9 2D ground term. Radial energy integrals were fitted to the observed levels of 4d85p, and the relative intensities of lines in the array were calculated with fitted eigenvectors. These intensities are in good qualitative agreement with the relative intensities visually estimated from the spectrograms. Least-squares-fitted values for the energy parameters and their ratios to the calculated Hartree–Fock values are given.

© 1984 Optical Society of America

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