Spectra and energy levels of Sm xxxiv, Eu xxxv, Gd xxxvi, and yb xxxxii

We present wavelengths and energy levels based on extreme-ultraviolet and x-ray transitions in the ions Sm+33, Eu+34, Gd+35, and Yb+41 of the cu i isoelectronic sequence. The sources of the spectra were laser-produced plasmas generated by the OMEGA laser facility at the University of Rochester’s Laboratory for Laser Energetics. The photographic spectra were recoreder by a 3-m grazing-incidence spectograph. The spectra lines fall between about 10 and 115 Å and we compare our results with previous measurements where available.