Hyperpolarizability The hyperpolarizability, a nonlinear-optical property of a molecule, is the second-order electric susceptibility per unit volume. [Wikipedia: https://en.wikipedia.org/wiki/Hyperpolarizability] Electricity and Magnetism QUDT http://qudt.org/vocab/quantity#CubicElectricDipoleMomentPerSquareEnergy http://dbpedia.org/page/Hyperpolarizability ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents.