Abstract

Spectra of 14 Fe-like ions from Ru¹⁸⁺ to Gd³⁸⁺ were observed with laser-produced plasmas and grazing-incidence spectrographs. The wavelengths range from 26 to 78 Å. Line identifications were made for transitions of the 3p⁶3d⁸–3p⁵3d⁹ array. The number of identifications varied from 42 in Ru¹⁸⁺ to 10 in Gd³⁸⁺. Experimental values for many of the energy levels of the 3p⁶3d⁸ and 3p⁵3d⁹ configurations were derived from the measured wavelengths. Predicted values for missing levels and for ions not observed in the isoelectronic sequence were obtained from parametric fits of the differences between the observed level values and relativistically calculated level values. Results are given for all ions of the sequence from Ru¹⁸⁺ to Yb⁴⁴⁺. Wavelengths for magnetic dipole transitions within the 3p⁶3d⁸ configuration calculated from the energy levels are given for several ions.

© 1988 Optical Society of America

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