Intrinsic hyperpolarizability
The intrinsic hyperpolarizability is defined as the hyperpolarizability divided by the Kuzyk Limit.[1] This quantity is scale invariant and thus is independent of the energy scale and number of electrons in a molecule that is being evaluated for its nonlinear optical response. Therefore, it can be used to compare molecules of different shapes and sizes.
The Intrinsic Hyperpolarizability can be used as a figure of merit for comparing molecules for their usefulness in electro-optics applications.
References
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