The shortcomings of the two-level model in extrapolating the molecular static first hyperpolarisability, β0, are discussed in the context of literature data. However, except for some spurious β0 data, in many other cases, the reported β0 values can be considered reasonably reliable due to a balancing of effects.
S. Di Bella, New J. Chem., 2002, 26, 495 DOI: 10.1039/B201711C
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