  ZnAs2 nanoclusters were fabricated by incorporation into pores of zeolite
Na-X and by laser ablation. Absorption and photoluminescence spectra of ZnAs2
nanoclusters in zeolite were measured at the temperatures of 4.2, 77 and 293 K.
Both absorption and PL spectra consist of two bands which demonstrate the blue
shift from the line of free exciton in bulk crystal. We performed the
calculations aimed to find the most stable clusters in the size region up to
size of the zeolite Na-X supercage. The most stable clusters are (ZnAs2)6 and
(ZnAs2)8 with binding energies of 7.181 eV and 8.012 eV per (ZnAs2)1 formula
unit respectively. Therefore, we attributed two bands observed in absorption
and PL spectra to these stable clusters. The measured Raman spectrum of ZnAs2
clusters in zeolite was explained to be originated from (ZnAs2)6 and (ZnAs2)8
clusters as well. The PL spectrum of ZnAs2 clusters produced by laser ablation
consists of a single band which has been attributed to emission of (ZnAs2)8
cluster.
