Inter-relations between additive shape invariant superpotentials

•We provide a pathway to interconnect all known additive shape invariant superpotentials.•We show that an ħ-dependent extension mechanism connects two ħ-independent superpotentials.•We generate the hyperbolic Scarf potential (based on a hypergeometric equation) from Morse (based on a confluent hypergeometric equation). All known additive shape invariant superpotentials in nonrelativistic quantum mechanics belong to one of two categories: superpotentials that do not explicitly depend on ħ, and their ħ-dependent extensions. The former group themselves into two disjoint classes, depending on whether the corresponding Schrödinger equation can be reduced to a hypergeometric equation (type-I) or a confluent hypergeometric equation (type-II). All the superpotentials within each class are connected via point canonical transformations. Previous work [19] showed that type-I superpotentials produce type-II via limiting procedures. In this paper we develop a method to generate a type I superpotential from type II, thus providing a pathway to interconnect all known additive shape invariant superpotentials.