▎ 摘　　要

The analytical expressions for the densities of states of adsorbed monomer, dimer, and trimer have been derived using the simplest models for the densities of states of metal, semiconductor, and single-sheet graphene. It has been shown that all specific features in the densities of states of small clusters are predominantly determined by the main peculiarities of the density of states of the substrate rather than by the adsorbed clusters themselves.