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Spectra of rare earth elements, praseodymium, europium, gadolinium, dysprosium and ytterbium (Z=59 to Z=70) have been recorded from a high temperature (Te=1-1 .4 keV) - low density (ne =1013cm-3) tokamak plasma, in the 50-200 Å range. The absolute brightnesses of the lines originating in 4-4 transitions of Cu I and Zn I-like ions of the above mentioned elements have been measured by means of a photometrically calibrated grazing incidence spectrometer. Newly identified Cu I-like, 4s 2S1/2 -4p 2P1/2 transitions in Pr3 0+, Eu3 4+ , Gd3 5+ , Dy3 7+ and Yb4 1 , and intercombination transitions 4s2 1So-4s4p 3P1 in the Zn I-like ions of the mentioned elements are presented. The identifications are based on interpolation of previous experimental results, ab initio energy level computations using the RELAC code and are substantiated by the time histories of individual spectral lines. The experimental line intensities of the Cu Iand Zn I-like ions are compared with those predicted by a collisional-radiative model under the conditions of the tokamak plasma

THE Cu I AND Zn I-LIKE SPECTRA OF Pr, Eu, Gd, Dy AND Yb EMITTED BY A TOKAMAK PLASMA IN THE 50-200 Å RANGE