The spectra of highly ionized xenon were generated in a tokamak plasma and photographed in the region 60–350 Å with a 2.2-m grazing-incidence spectrograph. The 4s<sup>2</sup>−4s4p transitions of Zn-like xenon (Xe XXV) and all the 4l−4(l + 1) transitions of Cu-like xenon (Xe XXVI) were measured with estimated uncertainties of ±0.005 Å. These measurements have been combined with previous wavelength measurements of Xe XXVI to determine energy levels. A value for the ionization energy of Xe<sup>25+</sup> of 6 912 400 ± 3000 cm<sup>−1</sup> (857.0 ± 0.4 eV) was derived.
© 1988 Optical Society of America
Victor Kaufman, Jack Sugar, and William L. Rowan, "Spectra of copperlike and zinclike xenon: Xe XXV and Xe XXVI," J. Opt. Soc. Am. B 5, 1273-1274 (1988)