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The spectra of highly charged ions of the elements In, Sb, I, and Cs have been recorded by using a 3-m grazing-incidence spectrograph at the University of Rochester’s Laboratory for Laser Energetics. Transitions in the Na i and Mg i isoelectronic sequences have been identified. Wavelengths in the range 7–100 Å were measured to an accuracy of ± 0.02 Å, and energy levels were derived from the measured wavelengths.

The spectra of krypton ions produced by the magnetic implosion of a krypton gas cylinder in the wavelength range from 10 to 250 Å have been observed. Lines from highly ionized krypton ions from Kr XXIV to Kr XXVII have been identified by isoelectronic sequence extrapolation and compared with ab initio relativistic calculations. Energy levels are derived for Kr XXVI.

The spectra of krypton ions produced by the magnetic implosion of a krypton gas cylinder in the wavelength range from 10 to 250 Å have been observed. Lines from highly ionized krypton ions from Kr xxiv to Kr xxvii have been identified by isoelectronic sequence extrapolation and compared with ab initio relativistic calculations. Energy levels are derived for Kr xxvi.

In this paper models for the relation of specular density to incident (x-ray) intensity with uncertainties are applied to experimental data, indicating methods for the correction of additional effects. Linearization and error calculations are simplified by double linear interpolation, and the effect of this is quantified. Relative first-order intensities are determined directly. Secondary linearization or calculation for higher-order lines gives correction factors that yield absolute and relative higher-order intensity ratios. The effects of energy and angle on linearization are included. Densitometry uncertainty is estimated and quantified.