Experimental results In ZllSe doped with 0.026 at% C r the zero phonon line (zpl) connected t o the emission peaking at 1 p m (10000 cm-') /1/ has been studied at low temperatures (Fig. l a )

We report about E P R measurements on Fe-Cu complexes in ZnSe crystals, grown by iodine transport reaction. The crystals were doped with 500 ppm Cu and contaminated with l e s s than 30 ppm Fe (proof limit of the AM). The measurements were carried out with a commercial Varian-E-Line spectrometer .operating in the X-band (9.1 GHz) in the temperature range from 1 . 8 to 6 K. Table 1). The observation of the transitions within the first excited doublet (so-called central doublet) is here re-1 ) Str. d e s 17. Juni 135, 1000 Berlin 12, Berlin (West).

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