The morse/smooth/linear variant is similar to the lj/smooth/linear variant in that it adds to the potential a shift and a linear term so that both, potential energy and force, go to zero at the ...

Potential has a general form of $V(x)=D_{e}(e^{-2\alpha(x-x_{e})}-2e^{-\alpha(x-x_{e})})$ This is not a symmetric potential. The local minima of excited state CMES ...