Sutherland potential

The Sutherland potential ^[1]^[2] is given by

\Phi _{12}\left(r\right)=\left\{{\begin{array}{lll}\infty &;&r\leq \sigma \\-\epsilon \left({\frac {\sigma }{r}}\right)^{\gamma }&;&r>\sigma \end{array}}\right.

where $\Phi _{12}\left(r\right)$ is the intermolecular pair potential, $r:=|\mathbf {r} _{1}-\mathbf {r} _{2}|$ is the distance between site 1 and site 2, $\sigma$ is the radius of the central hard core, $\epsilon$ is the energy well depth (Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle \epsilon >0} ), and $\gamma$ is a parameter that controls the interaction range. For example, for Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \gamma=6} the potential look like