# Local atomic coordination properties

Several properties related to the atomic bonds and angles between them can be computed using Atomes. The existence or the absence of a bond between two atoms $$i$$ of species $$\alpha$$ and $$j$$ of species $$\beta$$ is determined by the analysis of the partial $$g_{\alpha\beta}(r)$$ and total $$g(r)$$ radial distribution functions. Precisely Atomes will consider that a bond exists if the interatomic distance $$D_{ij}$$ is smaller than both the cutoff given to describe the maximum distance for first neighbor atoms between the species $$\alpha$$ and $$\beta$$, $$Rcut_{\alpha\beta}$$ (often the first minimum of $$g_{\alpha\beta}(r)$$), and the first minimum of the total radial distribution function, $$Rcut_{tot}$$.
Atomes allows the user to specify both $$Rcut_{\alpha\beta}$$ and $$Rcut_{tot}$$ to choose an appropriate description of the atomic bonds in the system under study. When atomic bonds in a model are defined properly other structural characteristics can be evaluated, as follows: