Using targets containing compounds of the elements cesium through lutetium, we studied the spectra of laser-produced plasmas in the grazing-incidence region from 40 to 200 Å. The spectra are characterized by strong regions of resonancelike emission extending typically over 9–18 eV. With increasing <i>Z</i>, the spectra show certain systematic variations in character and move monotonically toward shorter wavelengths. From a collisional-radiative plasma model, the ion stages responsible for the emission are identified as VIII through XVI. The resonances are attributed to 4<i>d</i>-4ƒ transitions that, because Δ<i>n</i> = 0, tend to overlap for different ion stages of the same element.
© 1981 Optical Society of AmericaPDF Article