Note
Morse potential
Manipulate[
Plot[
(1 - Exp[-a (r - R)])^2,
{r, 0, 5}, PlotRange -> {-1, 2}]
, {{a, 2}, 0, 10}, {{R, 2}, 0, 10}]
Reference
Wikipedia: Morse potential
Manipulate[
Plot[
(1 - Exp[-a (r - R)])^2,
{r, 0, 5}, PlotRange -> {-1, 2}]
, {{a, 2}, 0, 10}, {{R, 2}, 0, 10}]
Wikipedia: Morse potential