[en] Investigated is the spectral photoemission distribution from the ZnAs₂ and CdP₄ surface in combination with the Λ-modulated photoemission and Λ-modulated photoconductivity. The photoemission investigations have been performed in the vacuum (2-3)x10^-9 torr, the work function being reduced by the introduction of Cs, Cs-O up to obtaining the maximum emission current. It has been found that the emission threshold for CdP₄ starts in the region of 0.9 - 1.2 eV, for ZnAs₂ - in the region of 1.0 - 1.1 eV. In the CdP₄ and ZnAs₂ photoemission Λ-modulated spectra detected are the peaks testifying to a complex zone structure of these crystals in the region of the minimum of the interzonal gap. The data given agree with the results of the reflection spectra. The peak E'₁ (1.12 eV), that does not reveal itself in the reflection spectra, is present in the differential photoemission spectra. The spectral distribution of the Λ-modulated photoemission possesses slighter peculiarities in the energy region less than 1.5 eV