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semiconductors show interesting optical properties (1 to 3 and references therein). In this note we report photoluminescence spectra of tetragonal CdP2 single crystals at 4.2 K which show much more fine structure than the spectra published so far (3, 4).CdP single crystals were grown from the gaseous phase (2) without intentional doping. They were immersed in liquid He and excited with the light of a high pressure mercury lamp. 2 With low spectral resolution our spectra a r e identical with those of (4): two broad bands peaked a t 2.09 and 1.85 eV. With high resolution the high energy part of the 2.09 eV peak shows pronounced fine structure (Fig. 1). This fine structure is very similar to the near gap luminescence of tetragonal ZnP an indirect gap semiconductor with E = 2.200 eV a t T = 4.2 K (1). In ZnP this luminescence is 2' g 2 i ( n m ) Fig. 1. Photoluminescence spectrum of CdP2, T = 4.2 K

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