Dispersion of Optical Constants in Cdp2

Spectral dependences of the gyration tensor components g11, g33, refraction indices and birefringence of tetragonal CdP2 are investigated at 300 K. The optical activity of the crystal is found to be determined by both the crystal and the molecular contributions, the latter being due to the distortion of the tetrahedral symmetry of the structural elements. The dispersion of the refractive indices is discussed on the basis of a single‐effective‐oscillator model. The ionicity of CdP2 is equal to 0.56 and is close to the values of AIIBVI compounds and the ionicity of CdP bond in AIIBIVC V2 semiconductors. The dispersion of the spectroscopic properties of CdP2 is concluded to be mainly determined by the CdP bound. [Russian Text Ignored].