On the determination of the ZnAs$_2$ band structure parameters

A method for taking into account light scattering in ZnAs$_2$ and obtaining the $\alpha^\parallel(h\nu)$ absorption spectrum was suggested. At the $E\parallel c$ polarization, the absorption edge was shown to be determined by indirect and direct allowed transitions with the energy difference 64 meV between them, which involved exciton states. For both transitions, in the temperature range $80 \div 300$ K, the forbidden band width was determined.