Near and far infrared absorption in Cr doped ZnSe

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The optical absorption in Cr doped ZnSe has been measured for photon wavenumbes,, ν , from 2 cm −1 to the bandedge at about 20 000 cm −1 for temperatures from 1.2 to 300°K. The Cr produces an extremely sharp absorption line at ν = 7.43 cm −1 , additional broad absorption lines between 50 and 100 cm −1, a broad absorption band at 5500 cm −1, and some further structure at higher energies. As we will show, these results support the conclusion of earlier paramagnetic resonance studies that a static Jahn-Teller distortion of E symmetry is present in the ground state for Cr 2+ ions in ZnSe.